LOUISVILLE, Ky. (AP) _ Several people were rescued after two boats capsized and sank on the Ohio River and several other boats collided near the shoreline Saturday night following a fireworks show, officials said.

One person was hospitalized in critical condition and at least four others were treated for hypothermia, according to Coast Guard telecommunications specialist James Potter.

The boats capsized in separate incidents within a half-hour after the conclusion of Thunder Over Louisville, an annual fireworks show kicking off the Kentucky Derby Festival, said Chief Warrant Officer Bill Mackenzie.

Many of the estimated 600,000 spectators watched the event from hundreds of boats anchored in the river.

Six people on one boat were treated for minor injuries, Potter said. Five people on a second boat also were rescued. One was taken to University of Louisville Hospital and listed in critical condition, while the other four were treated for hypothermia on the shore, said Officer Robert Biven, a Jefferson County police spokesman.

Several other boats collided near the Louisville shoreline. Six people were pulled from the water and three were taken to the hospital, Louisville Police Department spokesman Rodney Estes said. None of their injuries were serious, he said.