By Allison Lampert

(Reuters) -As a bell sounded in the cockpit, three UPS pilots tried to control a cargo flight that crashed this week in Louisville, Kentucky, killing at least 13 people, the National Transportation Safety Board said on Friday.

While UPS flight 2976 started uneventfully, a repeating bell was heard on the aircraft’s flight cockpit voice recorder just 37 seconds after the crew called for takeoff thrust, NTSB member Todd Inman told reporters.

The bell persisted until the end of the recording 25 seconds later, which Inman believes signals the aircraft’s crash.

“During this time, the crew engaged in efforts to attempt to control the aircraft before the crash,” Inman said.

CRASH DESTROYED TWO BUSINESSES

The independent U.S. safety agency is leading the probe into the cras

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