Bulgarian investigators indicate that the Air Via Airbus A320 which overran at Varna last month had landed long in poor weather.
The aircraft touched down at a "considerable distance" from the threshold of runway 09 during the landing on 24 May, states the French investigation authority BEA, citing Bulgarian preliminary findings.
It had approached in "rapidly deteriorating" meteorological conditions, including rain and gusting and variable winds, the BEA says.
"The crew was unable to stop the aircraft on the runway and exited the runway 09," it says. The A320 struck the perimeter fence and sustained "serious" damage, finally coming to a halt 270m from the end of the runway, and 30m north of the centreline.
Two passengers among the 172 on board suffered broken bones during the evacuation. The flight from Leipzig also carried a crew of six.