Six people were killed after a helicopter on a training mission crashed in Far East Russia in the city of Khabarovsk. Eyewitness to the crash said the chopper went down after it hit a communications tower, RT reported.

The Mi-8 helicopter belonged to Vostok Airline. Even though it crashed within the city limits of Khabarovsk, no injuries or damage were reported on the ground as the accident took place in an uninhabited area.

Unidentified personnel belonging to Russia’s Emergencies Ministry said the entire crew was killed in the crash. Authorities investigating the crash suspect it could have been caused by a piloting error, technical snag or bad weather, The Moscow Times reported. They have recovered two black boxes from the crash site.