BIRMINGHAM, Alabama (REUTERS) - United States (US) government investigators looking into the crash of a UPS cargo plane said on Friday the pilots received a low altitude warning seven seconds before the sound of impact, according to data recovered from the cockpit voice recorder.

Investigators were able to retrieve data on Friday from flight recorders pulled from the wreckage that could shed light on Wednesday's fiery crash in Alabama that killed the jet's pilot and co-pilot.

"We do have good data," said National Transportation Safety Board spokesman Kelly Nantel.

It was the first confirmation that the cockpit voice and flight data recorders from the downed United Parcel Service Inc plane contained data that could help pinpoint the cause of the crash.