A Mid-air collision between a helicopter and a gyrocopter near Oshkosh, Wisconsin Air Show, left four dead and two injured Saturday, police authorities said.

The Mid-air crashes happened last Saturday near Oshkosh, Wisconsin Air Show, a major annual airshow

A collision between a gyrocopter and helicopter during a major Wisconsin airshow resulted in the death of two persons and two injured last Saturday.

Two others died on the day of the Wisconsin Air Show when a single-engine plane went into Lake Winnebago.

The two collision incidents happened at the EAA AirVenture Oshkosh Wisconsin Air Show and a convention.

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The National Transportation Safety Board is investigating both  crash incidents near Oshkosh, Wisconsin Air Show

The first crash occurred about 9 a.m. when the North American T-6 Texan ended up in Lake Winnebago. This was off-site for the Wisconsin Air Show.

And mid-air collision during Wisconsin Air Show at Wittman Regional Airport was reported at about 1:30 p.m.

Aircraft operations were stopped after the collision, and the Wisconsin Air Show was briefly delayed and started in the afternoon.

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