Moscow: Russian Air Force's MiG-31 fighter jet crashed on Tuesday in the Perm region of the country's Urals apparently due to a technical snag, killing both its pilots.

The jet crashed shortly after take-off on a routine training flight from the local air base, according to state-run news channel.

Another report said that due to a technical sang, the pilot tried to land the jet on a ploughed field, following which it overturned into a fireball.

Both pilots were killed in the crash, the state media said.

No casualties were reported on the ground, Perm Governor said on his twitter account.

The Defence Ministry has grounded all MiG-31 fleet till the end of probe, said a news agency.