LAKE GENEVA, Wisconsin.- Three people died and seven others were rescued Friday after a boat capsized on Lake Geneva as a strong storm passed through southern Wisconsin, an official said.

Many injuries were reported in Walworth County, Wisconsin, after the storm downed trees, downed power lines and damaged buildings, said Tom Hausner, undersheriff of the Walworth County Sheriff’s Department.

Hausner said he did not know any other information about the people who died and those rescued.

Lake Geneva city police are investigating, Hausner said. Officials there did not immediately respond to an email and voicemail from The Associated Press seeking more information.

Lake Geneva Mayor Todd Krause declared an emergency and said one person suffered minor injuries after being struck by a falling tree. Several areas of the city suffered power outages, it said in a statement.

Hausner said county authorities received multiple 911 calls reporting damage and people trapped in buildings and seeking help. He said officers responded immediately but were delayed by downed power lines and trees blocking streets.

“There are power lines everywhere. We urge people to stay away,” he said.

Hausner said his agency asked authorities in nearby counties and the Wisconsin Department of Natural Resources for help.

Lake Geneva in southern Wisconsin draws tourists from the Chicago area and beyond. The population in Walworth County, where the lake is located, nearly doubles during holiday weekends, Hausner said.

Storms that hit the Midwest on Friday afternoon and evening led several cities to cancel Christmas festivals and reschedule fireworks shows.

The National Weather Service issued a severe storm watch for Lake Geneva, Wisconsin, saying the forecast showed heavy rain on Friday with rain lingering through Independence Day and a continued chance of showers and thunderstorms throughout the weekend.