An image tweeted by the Austin police department shows members of the FBI.
Austin Police Department
An image tweeted by the Austin police department shows members of the FBI.
Now playing
01:13
Video shows bomber blow himself up as officers near
Austin bomber surveil
WOAI/KABB
Austin bomber surveil
Now playing
00:47
Newly-released images of bomber inside FedEx
Austin bomber dead police presser sot_00000822.jpg
CNN
Austin bomber dead police presser sot_00000822.jpg
Now playing
01:44
Police: Austin suspect killed self with bomb
Pres. Trump Meeting Spray with Saudi Prince/TAPE
CNN
Pres. Trump Meeting Spray with Saudi Prince/TAPE
Now playing
00:57
Trump on Texas bombings: These are sick people
FedEx
KSAT
FedEx
Now playing
00:54
Fifth explosion rocks Texas
A bomb detecting unit walks along a street near the scene of an explosion, Sunday, March 18, 2018, in Austin, Texas. (Nick Wagner/Austin American-Statesman via AP)
Nick Wagner/AP
A bomb detecting unit walks along a street near the scene of an explosion, Sunday, March 18, 2018, in Austin, Texas. (Nick Wagner/Austin American-Statesman via AP)
Now playing
00:55
2 injured in Austin explosion, authorities say
Members of law enforcement stage near the area where a suspect in a series of bombing attacks in Austin blew himself up as authorities closed in, Wednesday, March 21, 2018, in Round Rock, Texas. (AP Photo/Eric Gay)
Eric Gay/AP
Members of law enforcement stage near the area where a suspect in a series of bombing attacks in Austin blew himself up as authorities closed in, Wednesday, March 21, 2018, in Round Rock, Texas. (AP Photo/Eric Gay)
Now playing
02:52
Bomb-making materials found in suspect's home
CNN
Now playing
02:08
Austin mayor urges caution after 4th explosion
KEYE
Now playing
01:42
Police: Tripwire may have triggered explosion
Authorities work on the scene after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)
Ricardo B. Brazziell/Austin American-Statesman via AP
Authorities work on the scene after multiple explosions in Austin on Monday, March 12, 2018. Police are responding to another explosion Monday, that badly injured a woman, hours after a package bomb killed a teenager and wounded a woman in a different part of the city. (Ricardo B. Brazziell/Austin American-Statesman via AP)
Now playing
01:56
Deadly package bombs were left on doorsteps
Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)
Ricardo B. Brazziell/Austin American-Statesman via AP
Authorities are investigating the scene in East Austin, Texas, after a teenager was killed and a woman was injured in the second Austin package explosion in the past two weeks Monday, March 12, 2018. Authorities say a package that exploded inside of an Austin home on Monday is believed to be linked to a deadly package sent to another home in Texas' capital city earlier this month. (Ricardo B. Brazziell/Austin American-Statesman via AP)
Now playing
02:05
Police: Deadly blasts in Texas connected
An image tweeted by the Austin police department shows members of the FBI.
Austin Police Department
An image tweeted by the Austin police department shows members of the FBI.
Now playing
00:56
Police: Report any unexpected packages
(CNN) —  

Sean Philips had just woken up and was sitting on his couch when he heard the blast that would take his neighbor’s life.

The explosion, police now say, came from a package that Anthony Stephan House encountered on his front porch in north Austin on the morning of March 2.

Police say it was the first of three mysterious package bombings in 10 days in Texas’ capital – explosions that have killed two people, including House, injured two others and left city residents on edge and highly suspicious of packages delivered to their homes.

Anthony Stephan House, 39, was killed in a package explosion outside his house in Austin on March 2.
Austin Police Department
Anthony Stephan House, 39, was killed in a package explosion outside his house in Austin on March 2.

Philips said he was waiting for his children to get ready for the day when he heard something like “an empty trash dumpster getting hit by a truck” around 6:50 a.m.

“I ran outside and I saw him standing over there” in front of his house, covered in blood with his clothing torn up, Philips told CNN on Tuesday morning. “He was glazed over, and …. wasn’t responding to seeing me or hearing me, or anything.

“He collapsed. I gave him two rescue breaths to get him breathing again, and called 911, and did what they told me.”

Sean Philips
CNN
Sean Philips

Medics arrived after another neighbor helped roll House over. House, 39, would die of his injuries.

“It’s been the most traumatic thing in my life,” Philips said.

This package, and two more that exploded at other Austin residences 10 days later, were placed in front of houses, Austin Police Chief Brian Manley said. All were average-sized delivery boxes, and they weren’t delivered by the US Postal Service or delivery services such as UPS or FedEx, police said.

Philips said he didn’t immediately know that a package had exploded. He said he was too zoned in on his wounded neighbor to understand what had happened.

“At the time, we assumed it was a gas explosion or something completely accidental,” he said.

Police said last week they thought the incident was isolated, and they didn’t immediately rule it a homicide. But they consider it a homicide now, and say they believe the three explosions are related.

But they say they don’t know of a motive. Philips said he doesn’t know what could have prompted the bombing, either.

“Nobody saw anything strange or odd. One neighbor says her dogs bark anytime anybody walks by – and they do – and they didn’t bark that morning at all. There’s no sign or clue to what happened,” he said.

Philips said he didn’t know House well, but the two men were acquainted because their daughters are friends.

He said his neighborhood is “on guard.”

“Everybody is real suspicious if there’s any packages,” he said. “But most of all we just want answers, to know what happened to our neighbor and what’s happening to the other people in Austin.”

CNN”s Nick Watt and Jason Morris reported from Austin, and CNN’s Jason Hanna wrote in Atlanta.