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EDWARDSVILLE, Ill. (KTVI) – Six people have died and one other person was injured Friday night in the Amazon facility collapse caused by a tornado that touched down in Edwardsville, Illinois.

An additional 45 people made it out safely.

Both sides of the warehouse used to prepare orders for delivery collapsed inward and the roof caved, Edwardsville Fire Chief James Whiteford said at a Saturday news conference.

Authorities received reports of workers being trapped and the fire unit arrived within six minutes, according to Whiteford. Police helped pull people from the rubble.

Whiteford said crews would search the rubble for several days, but considering the significant damage authorities didn’t expect to find further survivors. Rescue operations have now shifted to recovery operations.

Authorities have not released names of the victims.

  • A car sits in the debris caused by a tornado in Bowling Green, Ky., Saturday, Dec. 11, 2021. A monstrous tornado killed dozens of people in Kentucky and the toll was climbing Saturday after severe weather ripped through at least five states, leaving widespread devastation. (AP Photo/Michael Clubb)
  • Dog owner Derrick Starks, left, Chris Buchanan, center and Niki Thompson, right, both from neighboring counties, attempt to rescue Cheyenne from a tornado-damaged home in Mayfield, Ky., on Saturday, Dec. 11, 2021. Tornadoes and severe weather caused catastrophic damage across multiple states late Friday, killing dozens of people overnight. (AP Photo/Mark Humphrey)
  • A fallen tree caused by a tornado takes down power lines and damages a car in Bowling Green, Ky., Saturday, Dec. 11, 2021. Storms swept through Bowling Green, Ky. near the Tennessee border, tearing roofs off homes and flinging debris into roadways. (AP Photo/Michael Clubb)
  • A car wrecked by a tornado sits on top of another car in Bowling Green, Ky., Saturday, Dec. 11, 2021. A monstrous tornado killed dozens of people in Kentucky and the toll was climbing Saturday after severe weather ripped through at least five states, leaving widespread devastation. (AP Photo/Michael Clubb)
  • In this photo taken by a drone, buildings are demolished in downtown Mayfield, Ky., on Saturday, Dec. 11, 2021, after a tornado traveled through the region Friday night. A monstrous tornado killed dozens of people in Kentucky and the toll was climbing Saturday after severe weather ripped through at least five states, leaving widespread devastation. (Ryan C. Hermens/Lexington Herald-Leader via AP)
  • Damaged vehicles and personal property are strewn over a wide area along Kentucky 81, Saturday, Dec. 11, 2021, in Bremen, Ky, after a devastating tornado swept through the area on Friday night. (Greg Eans/The Messenger-Inquirer via AP)
  • Emergency response workers dig through the rubble of the Mayfield Consumer Products candle factory in Mayfield, Ky., Saturday, Dec. 11, 2021. Tornadoes and severe weather caused catastrophic damage across multiple states late Friday, killing several people overnight. (AP Photo/Timothy D. Easley)
  • Matt Steele, right, digs through the remains of a house destroyed by a tornado in Bowling Green, Ky., Saturday, Dec. 11, 2021. (AP Photo/Michael Clubb)
  • A workman uses an excavator to pile up the debris from a destroyed warehouse in Mayfield, Ky., Saturday, Dec. 11, 2021. Tornadoes and severe weather caused catastrophic damage across multiple states late Friday, killing dozens of people overnight. (AP Photo/Timothy D. Easley)
  • Firefighters search a debris field that came from a house that was ripped off its foundation and trees were cut off after a tornado ripped along Highway F at the intersection of Stub Road in St. Charles County, Mo., on Friday, Dec. 10, 2021. A monstrous tornado, carving a track that could rival the longest on record, ripped through the middle of the U.S. in a stormfront that killed dozens and tore apart a candle factory, crushed a nursing home, derailed a train and smashed an Amazon warehouse. (David Carson/St. Louis Post-Dispatch via AP)
  • In this aerial photo, a collapsed factory is seen with workers searching for survivors, Saturday, Dec. 11, 2021, in Mayfield, Ky., after tornadoes came through the area the previous night. (AP Photo/Gerald Herbert)
  • A family digs through the remains of their apartment in Mayfield, Ky., Saturday, Dec. 11, 2021. Tornadoes and severe weather caused catastrophic damage across multiple states late Friday, killing several people overnight. (AP Photo/Timothy D. Easley)

The damage was extensive, and the structures’ steel support pillars were exposed after the walls and roof caved.

“These walls are made out of 11-inch thick concrete, and they’re about 40 feet tall, so a lot of weight from that came down,” Whiteford said.

The National Weather Service’s survey found the damage was consistent with an EF-3 tornado. However, the survey is ongoing and the tornado’s rating may increase.

The Amazon facility, among three in Edwardsville, is a 1.1 million square foot “delivery station” that employs about 190 workers across several shifts, according to Amazon. The facility, which opened in July 2020, prepares orders for “last-mile delivery” to customers. Edwardsville is about 25 miles northeast of St. Louis.

“Our thoughts and prayers are with the victims, their loved ones, and everyone impacted by the tornado,” Amazon spokesperson Kelly Nantel said in a statement. “We’re continuing to support our employees and partners in the area.”

Amazon said that when a site is made aware of a tornado warning, all employees are notified and directed to move to a shelter.

But company officials declined to answer specific questions about when employees were warned.

The Associated Press contributed to this report.