TAIPEI, Taiwan — Moments before the TransAsia Airways propjet banked sharply and crashed into a river, one of its pilots said, “Mayday, mayday, engine flameout,” according to a Taiwanese aviation official.

“Engine flameout” refers to flames being extinguished in the combustion chamber of the engine, so that it shuts down and no longer drives the propeller. Causes could include a lack of fuel or being struck by volcanic ash, a bird or some other object. “Mayday” is an international distress call.

At least 32 people on board the ATR 72 were killed and 15 survivors were injured in the crash in Taiwan’s capital, the latest in a series of aircraft disasters befalling Asian airlines. Divers were searching in the river for the remaining 11 people on board, including the two pilots. The plane’s black boxes were found overnight.

Video images of Flight 235’s final moments in the air captured on car dashboard cameras appear to show the left engine’s propeller at standstill as the aircraft turned sharply.