As per Federal Aviation Administration, two people were killed and two injured when a helicopter and a gyrocopter collided at Wittman Regional Airport about 1.30 p.m on SaturdayEarlier, two others were killed when a single-engine plane went into nearby Lake Winnebago, NBC news quoted Capt. Lara Vendola-Messer with the Winnebago County Sheriff’s Office as saying.The first crash occurred about 9 a.m. when a single-engine North American T-6 Texan went into Lake Winnebago after departing Wittman Regional Airport.The two injured people were stabilised at a hospital, EAA AirVenture Oshkosh organisers said in a statement.--IANSsvn(Disclaimer: This post has been auto published from IANS news agency without any modification to the text and has not been reviewed by editor)