LaGuardia crash report reveals safety failures

Federal investigators found that a key runway safety system failed to activate before the deadly March 22 collision.

The report also detailed how a firefighter heard a 'stop' command from air traffic control but was unsure who the warning was intended for.

Stretched resources and human error appear to have contributed to the tragedy, which occurred during an emergency response.

The NTSB is continuing its investigation into the coordination between ground vehicles and aircraft at the busy New York City hub.