4 people were killed in separate aircraft crashes before a major air show in Oshkosh, Wisconsin

Four people are dead and two are injured after two aircraft collided in midair and another crashed into a lake Saturday shortly before an air show at a major aviation convention in Oshkosh, Wisconsin, authorities said.

Two people died when a North American T-6, a vintage military training craft, crashed around 9 a.m. into Lake Winnebago, according to the Coast Guard, who recovered the bodies of the two people on board Saturday night.

The plane descended rapidly from an altitude of around 3,000 feet, the Coast Guard said. Several agencies, including the Oshkosh Fire Department and the Coast Guard responded to the crash, according to a statement from the Experimental Aircraft Association, which organizes the annual AirVenture convention.

Two people were killed in a separate crash Saturday around noon, when a RotorWay 162F helicopter and an ELA 10 Eclipse gyrocopter collided midair. The accident happened in an area of Wittman Regional Airport designated for the event, organizers said.

A gyrocopter looks like a small helicopter with a propeller at the rear. Its rotor, which provides lift, spins freely without the help of the engine.

Two people who were injured in the accident were transported to a local hospital and are in stable condition, the statement said.

It is unclear which victims were on which aircraft, but event organizers said the helicopter and gyrocopter belonged to event attendees and were not involved in the air show.