WLS
Now playing
01:32
Plant explosion leaves one dead and others missing
Getty Images
Now playing
01:49
Cheney and Kinzinger respond to McCarthy over committee comments
Popular syndicated conservative radio personality Phil Valentine has started a new podcast with his adult son, Campbell, that has nothing to do with politics. The father and son record a podcast in their cabin in Brentwood on Thursday, March 7, 2019. 

Nas Philvalentineandson 01
Shelley Mays/Nashville/Shelley Mays, / The Tennessean
Popular syndicated conservative radio personality Phil Valentine has started a new podcast with his adult son, Campbell, that has nothing to do with politics. The father and son record a podcast in their cabin in Brentwood on Thursday, March 7, 2019. Nas Philvalentineandson 01
Now playing
04:50
Conservative radio host changes tune on Covid-19 vaccination
Church of Glad Tidings
Now playing
01:16
Reporter calls out Flynn's comment after being given an AR-15
Now playing
03:36
'Dangerous and stupid': ER physician on packed, maskless Trump event
Now playing
03:05
Doctor: 'We've all lost patients here in the last few weeks'
Sara Holton Gard wants officials to set a mask rule for all that would make it easier to enforce.
CNN
Sara Holton Gard wants officials to set a mask rule for all that would make it easier to enforce.
Now playing
03:29
Debate escalates over masks as the start of school year approaches
Now playing
04:30
Fox News viewers are less likely to get vaccinated, poll shows
Deputy Secretary of State Wendy Sherman meets with Chinese Foreign Minister Wang Yi in Tianjin, China, on July 26, 2021.  Beijing has indicated that the U.S. is treating China as an "imaginary enemy" after the meeting between top diplomats Sherman and Wang.
Sherman Meets With Wang in Tianjin, China, Beijing - 26 Jul 2021. U.S. State Department/UPI/Shutterstock
U.S. State Department/UPI/Shutterstock
Deputy Secretary of State Wendy Sherman meets with Chinese Foreign Minister Wang Yi in Tianjin, China, on July 26, 2021. Beijing has indicated that the U.S. is treating China as an "imaginary enemy" after the meeting between top diplomats Sherman and Wang. Sherman Meets With Wang in Tianjin, China, Beijing - 26 Jul 2021. U.S. State Department/UPI/Shutterstock
Now playing
01:09
Chinese official: The US portrays China as an imaginary enemy
France's President Emmanuel Macron speaks with doctors and nurses working at the French Polynesia Hospital Centre in Papeete following his arrival for a visit to Tahiti in French Polynesia on July 24, 2021.
LUDOVIC MARIN/AFP/Getty Images
France's President Emmanuel Macron speaks with doctors and nurses working at the French Polynesia Hospital Centre in Papeete following his arrival for a visit to Tahiti in French Polynesia on July 24, 2021.
Now playing
01:15
See what Macron said about anti-vaccine protesters
CCTV
Now playing
00:51
See sandstorm engulf city in China
Dr. Michael Bolding vpx
Dr. Michael Bolding vpx
Now playing
03:37
Hear doctor's emotional plea for people to get vaccinated
The US Navy has finally acknowledged footage purported to show UFOs hurtling through the air. And while officials said they don't know what the objects are, they're not indulging any hints either.
US Department of Defense
The US Navy has finally acknowledged footage purported to show UFOs hurtling through the air. And while officials said they don't know what the objects are, they're not indulging any hints either.
Now playing
05:47
The 'baffling' thing about UFO tech that has security experts worried
AFPTV
Now playing
00:31
See disaster-stricken lagoon turned pink
Gov. Kay Ivey gives the State of the State Address to a joint session of the Alabama Legislature on Tuesday, Feb. 4, 2020, in the old house chamber of the Alabama State Capitol in Montgomery, Ala. (AP Photo/Vasha Hunt)
Vasha Hunt/AP
Gov. Kay Ivey gives the State of the State Address to a joint session of the Alabama Legislature on Tuesday, Feb. 4, 2020, in the old house chamber of the Alabama State Capitol in Montgomery, Ala. (AP Photo/Vasha Hunt)
Now playing
01:00
Alabama governor: It's time to start blaming unvaccinated folks
Pool
Now playing
02:06
WaPo: This is what Trump's PAC is spending its money on
TMFPD
Now playing
00:48
Crew battling Tamarack Fire makes narrow escape out of fire and flames
CNN —  

A massive blast that rocked parts of an Illinois town Friday night has resulted in three deaths, with one person still unaccounted for as of Sunday evening.

The explosion happened at AB Specialty Silicones in Waukegan, about 40 miles north of Chicago, police said. The company describes itself as a manufacturer of specialty silicone chemicals.

The “catastrophic explosion” hit around 9:30 p.m. Friday, said Cmdr. Joe Florip, a Waukegan police spokesman. The plant was open at the time of the explosion, he said, and nine people were in the building.

Waukegan Fire Marshal Steven Lenzi said everyone affected was an employee working at the time. Four were taken to area hospitals with moderate to serious injuries, and one later died from injuries, officials said. Two others were seen but requested no treatment.

Three people were unaccounted for.

One person was found dead at the scene Saturday, Lenzi said. Authorities weren’t able to continue any further recovery efforts until they brought in equipment to dismantle the “heavy unsafe structural remains.”

Search will resume for one person missing

A second body was located on Sunday in “a heavily damaged portion of the building,” according to a statement from the Waukegan Fire Department. “Due to the complexities of removing the victim from the debris it took crews over two hours” to recover the body, the statement said.

The search for the one person still unaccounted for will resume at 9 a.m. local Monday, Lenzi said.

No cause for the explosion has been determined yet. The state fire marshal and the Occupational Safety and Health Administration (OSHA) will assist with an investigation, Lenzi said

Florip said he would “categorize this as a massive explosion.”

“Many neighboring properties are going to have damage,” he said.

Damage is estimated at more than $1 million, Lenzi said. The blast affected at least five other nearby buildings.

After the explosion, the Lake County Sheriff’s Office said on Twitter it was aware of “a very loud explosion sound” and “ground shaking.”

Authorities later said they had no concern about air quality or a need to shelter in place.

“The Illinois EPA assisted with air quality monitoring and water runoff monitoring and the Waukegan Fire Department was not made aware of any public health concerns from this incident,” Lenzi said.

Lenzi recalled one “fire instance” at the plant over the past 10 years. The plant has been “very responsive” and was “safety cautious after the incident from the previous fire,” he said. “We have had no instances as far as code violations or anything like that with the plant.”

CNN’s Jay Croft contributed to this report.