There is a rumor that landing gear lever was pulled before leaving runway. When there is a pressure on landing gear, it won't retract. But when pressure is relieved (plane has taken off), landing gear is automatically retracted. It could be that there was some unfortunate windshear or vibration lifting the aircraft temporarily before actual takeoff initiating automatic landing gear retraction and leaving aircraft on belly with damaged propellers/engines.
There have been similar incidents before.
Accident: Yakutia AN24 at Yakutsk on Feb 4th 2010, early gear retraction causes rejected takeoff
That could explain why airplane came to a stop way before the end of the runway and why landing gear was completely retracted.
Accident: Exin AN26 at Tallinn on Aug 25th 2010, gear collapse during takeoff