A repeating bell sounded in the cockpit for 25 seconds as pilots tried to control a UPS cargo plane that caught fire, had an engine fall off and crashed during takeoff this week in Louisville, Kentucky, a National Transportation Safety Board member said Friday. The crash killed at least 14 people , including the three pilots on board.

The cockpit voice recorder captured a persistent bell that began about 37 seconds after the crew called for takeoff thrust, and the bell continued until the recording ended, which investigators believe was the final point of impact, NTSB member Todd Inman said.

Inman said there could be different types of alarms with varying meanings, but investigators know there was a fire in the plane's left wing and will use flight data to help determine a c

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