CHICAGO - Seven people were killed when a devastating tornado tore through northwestern Ohio, a state emergency management official said on Sunday.
"All seven deaths were a result of the tornado," said Tamara McBride, spokeswoman for the Ohio Emergency Management Agency, adding that the fatalities were from a tornado that touched down in Wood County, southeast of Toledo, Ohio.
As many as seven tornadoes touched down in northwestern Ohio late Saturday and early Sunday morning, according to data from the US National Weather Service.
Local media reported dozens of injuries and damaged buildings.
The tornadoes and thunderstorms also triggered the automatic shutdown of a nuclear power plant in Michigan.
In northwest Ohio, tornadoes destroyed a dozen homes and partially demolished the police headquarters and high school, authorities said.
An emergency command center was set up behind the damaged police administration building, and the school's graduation ceremony was postponed.
"Windows were blown out of the buildings, buses overturned, the police department lost all of their vehicles except the ones that were occupied by officers," said a police spokesman in a neighboring township where calls were re-routed.
Severe storms caused the automatic shutdown of the Fermi 2 nuclear power plant on the shore of Lake Erie in southeast Michigan after a key area of the plant lost its power feed, said Monroe County spokesman Dan Smith.
All safety systems at the plant were functioning and the plant was stable, although an exterior wall was slightly damaged, Smith said.