MOSCOW (AP) — The director of a drone factory in the Urals was badly wounded Wednesday when his car exploded, the state Tass news agency reported.

Tass said that Vladimir Tkachuk was hospitalized in grave condition following the explosion. It didn’t immediately give details of the explosion or say who could be responsible.

Tkachuk headed the Uraldrinzavod factory that manufactured the Upyr drones for the Russian military.