Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. 
Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
MARK RALSTON/AFP/Getty Images
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
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(CNN) -- In the early days of the investigation into the Las Vegas mass shooting, two people were named as persons of interest in the case, according to newly released police search warrants.        One was deceased shooter Stephen Paddock's girlfriend, Marilou Danley, who has since been publicly cleared in the case. The name of the other was redacted in hundreds of pages of documents released Tuesday to the media.        The Las Vegas Review-Journal has identified that individual as Douglas Haig. Haig did not respond to phone calls Tuesday evening.
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(CNN) -- In the early days of the investigation into the Las Vegas mass shooting, two people were named as persons of interest in the case, according to newly released police search warrants. One was deceased shooter Stephen Paddock's girlfriend, Marilou Danley, who has since been publicly cleared in the case. The name of the other was redacted in hundreds of pages of documents released Tuesday to the media. The Las Vegas Review-Journal has identified that individual as Douglas Haig. Haig did not respond to phone calls Tuesday evening.
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This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)
Las Vegas Metropolitan Police Department via AP
This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)
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Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. 
Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
MARK RALSTON/AFP/Getty Images
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
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LAS VEGAS, NV - OCTOBER 02:  A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
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LAS VEGAS, NV - OCTOBER 02: A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
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LAS VEGAS, NV - OCTOBER 02:  An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, killing over 20 people. Police have confirmed that one suspect has been shot dead. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
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LAS VEGAS, NV - OCTOBER 02: An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, killing over 20 people. Police have confirmed that one suspect has been shot dead. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
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Story highlights

NEW: Vigil for fallen officer draws hundreds

The massive tank was hit twice; there was no danger of explosion, officials say

Las Vegas CNN —  

As investigators tried to piece together the reason why a man with an arsenal of rifles rained deadly fire down on Las Vegas concertgoers, dozens of his victims remained in the hospital.

At Sunrise Hospital, where 200 of the killed, wounded and hurt were taken Sunday night, 45 people are still hospitalized, about half of them in critical condition, according to the medical center’s most recent update.

And it appears gunman Stephen Paddock was not just shooting at people when he killed 58 country music lovers at a festival near the Mandalay Bay hotel.

A large fuel tank at nearby McCarran International Airport was hit by two bullets, one penetrating the outer shell, officials said on the airport’s Facebook page.

But there never was any danger, officials said.

“There is almost zero likelihood gunfire damage could trigger a fire or explosion at a commercial fuel storage facility,” the Facebook post said.

There were several vigils held at twilight in Las Vegas on Thursday, including one for Officer Charleston Hartfield, who was off-duty and attending the concert when he was killed. Hundreds of people came to Police Memorial Park to honor his memory.

There is still much mystery surrounding Paddock, a 64-year-old retired accountant from Mesquite, Nevada, who liked to gamble in Vegas casinos and had more than 40 guns in two homes and his hotel suite.

Did he want to escape?

Chilling clues revealed by police suggest the man behind the deadliest mass shooting in modern US history planned to inflict even more carnage.

Paddock didn’t just have 23 weapons in his hotel suite, which he turned into a sniper’s nest.

He also had more than 50 pounds of explosives and 1,600 rounds of ammunition in his car in the hotel parking lot, police said.

Investigators think Paddock intended to survive the massacre, Las Vegas police Sheriff Joseph Lombardo said.

“He was doing everything possible to see how he could escape,” Lombardo said, declining to detail specifics.

But what motivated Paddock to kill dozens of strangers and whether he had help remains a mystery.

Law enforcement officials who have been briefed on the investigation told CNN on Thursday they have seen no indication that Paddock had an accomplice or that anyone was aware of his planning.

Law enforcement analyst: Car bomb possible

Of the explosives found in Paddock’s car, authorities first found several pounds of ammonium nitrate, Lombardo said.

He said a later search of cases found in the car revealed 50 pounds of Tannerite – a brand-name product that’s marketed as explosive rifle targets.

The cache of explosives in Paddock’s car could indicate plans for a car bomb, CNN law enforcement analyst Art Roderick said.

“Those explosives, that’s the scary part. What was he going to do with those? I mean, you don’t just acquire them and leave them in your vehicle and not have a plan for them,” said Roderick, former assistant director of the US Marshals Service.

“The Tannerite could have set off the ammonium nitrate,” Roderick said. “So, was he using that as a vehicle-borne explosive device?”

It’s possible no one will ever learn Paddock’s plan for the explosives. The gunman killed himself before police breached his hotel room door.

Booking rooms near other music festivals

Before checking into Mandalay Bay days before the massacre, Paddock rented a room at a Las Vegas condo complex that overlooked another music festival.

Paddock rented the room at the Ogden condo complex via Airbnb during the Life is Beautiful music festival, which lasted from September 22 to 25, the sheriff said.

“Was he doing pre-surveillance? We don’t know yet. This is all conjecture at this point,” Lombardo said.

Security ‘top priority’ for concert, festival organizers following Vegas massacre

And in August, a person named Stephen Paddock reserved a room at Chicago’s Blackstone Hotel during the city’s Lollapalooza music festival, said Wagstaff Worldwide, which represents the hotel.

But that person never checked into the hotel, which overlooked the festival, Wagstaff Worldwide spokeswoman Emmy Carragher said.

It was not immediately clear whether the Stephen Paddock who booked the room was the same Stephen Paddock behind the Las Vegas massacre.

The Chicago Tribune, citing an anonymous law enforcement source, reported that it was the shooter Stephen Paddock who booked the room at the Blackstone Hotel.

Wagstaff Worldwide said Blackstone Hotel is cooperating with authorities.

Victim in a coma

Tina Frost, 27, is one of those victims still in critical condition.

She was at the Route 91 Harvest festival with her boyfriend and other friends when she was shot near one of her eyes. She has been in a coma for four days.

“She has her whole life in front of her, and with one incident, we have a nightmare,” her mother, Mary Moreland, told CNN.

Frost was among the victims saved by a stranger who carried her through the carnage to a pickup truck.

An online fundraiser has accumulated almost $400,000 for Frost’s medical bills.

“I’d throw it all away to have my daughter back,” Moreland said. “It’s overwhelming.”

A new timeline

New evidence shows Paddock fired his first shots into the Route 91 Harvest music festival at 10:05 p.m. Sunday – three minutes earlier than what police previously reported, Lombardo said.

For 10 minutes, Paddock sprayed hundreds of bullets into the crowd about a quarter mile away. The shots pummeled the gathering of 22,000 people with devastating speed, due to the help of bump stocks – legal accessories that make weapons fire similarly to an automatic rifle.

As the indiscriminate killings continued, police said, cameras were positioned inside and outside Paddock’s hotel suite and in the door’s peep hole.

People scramble after gunfire strikes the Route 91 Harvest country music festival in Las Vegas.
David Becker/Getty Images
People scramble after gunfire strikes the Route 91 Harvest country music festival in Las Vegas.

A security guard approached the 32nd-floor suite and was shot in the leg by Paddock. The gunman fired “well over 200 rounds” into the hallway, Lombardo said.

“It’s amazing that security guard didn’t sustain additional injury,” the sheriff said.

At 10:15 p.m., Paddock fired his last shots, police said. Three minutes later, a security guard told Las Vegas police he’d been shot and directed officers to the gunman’s room.