Sitapur, July 26 (ANI): A helicopter of the Indian Air Force (IAF) crashed in Sitapur district of Uttar Pradesh killing all seven people on board, including two pilots. According to reports, the advanced landing chopper-307 was on its way to Allahabad from Bareilly when it crashed in a field in village Ahirwa in Sitapur district, around 70 Kms away from Lucknow. The pilot gave a _may-day_ (emergency) call and soon after, there was a loss of contact on radar and radio. There is no reported damage on ground. Reportedly, eleven helicopters belonging to the armed forces have crashed in the past three years.