Russian authorities said on Tuesday a "technical malfunction" probably caused a military jet to crash into a block of flats in Yeysk, near Ukraine, killing at least 13 people including three children.
Investigators said they were questioning the pilots of the Sukhoi Su-34, who managed to parachute out of the plane before it crashed on Monday into the nine-storey building, engulfing it in flames.
Nineteen people were injured, four of them critically.
A criminal inquiry has been launched into possible violations of flight rules.
