ST. LOUIS (AP) — At least seven people died and authorities were searching from building to building for people who were trapped or hurt after severe storms including at least one possible tornado swept through Missouri.

The storms were part of a severe weather system Friday that caused severe damage in Missouri, spawned tornadoes in Wisconsin, left hundreds of thousands without power in the Great Lakes region and brought a punishing heat wave to Texas.

The storms Friday afternoon tore roofs off buildings, blew out windows, ripped bricks off siding and yanked up trees and power lines. St. Louis Mayor Cara Spencer confirmed five deaths in her city and said more than 5,000 homes were affected and about 100,000 customers remained without electricity on Friday night.

“This is truly, truly devastating,” Spencer said, adding that the city was in the process of declaring an emergency and an overnight curfew Friday had been put into place in the neighborhoods with the most damage.

The number of people injured was not immediately known. Barnes-Jewish Hospital received 20 to 30 patients from the storm with some in serious condition and most expected to be discharged by Friday night, according to hospital spokesperson Laura High.

St. Louis Children’s Hospital received 15 patients with two of them expected to remain in the hospital into the weekend, she said.

National Weather Service radar indicated a tornado touched down between 2:30 p.m. and 2:50 p.m. in Clayton, Missouri, in the St. Louis area. The apparent tornado touched down in the area of Forest Park, home to the St. Louis Zoo and the site of the 1904 World’s Fair and Olympic Games the same year.

At Centennial Christian Church, City of St. Louis Fire Department Battalion Chief William Pollihan told The Associated Press that three people had to be rescued after part of the church crumbled. One of those people died.

Stacy Clark said his mother-in-law Patricia Penelton died in the church. He described her as a very active church volunteer who had many roles, including being part of the choir.

Jeffrey Simmons Sr., who lives across from the church, heard an alert on his phone and then the lights went out.

“And next thing you know, a lot of noise, heavy wind,” he said. He and his brother went into the basement. Later, he realized it was worse than he thought. “Everything was tore up.”