New Delhi, March 24 -- Investigators probing the deadly collision involving Air Canada Flight 8646 at LaGuardia Airport are focusing on why a fire truck was cleared to cross the runway moments before the aircraft landed. Preliminary timelines suggest the vehicle entered the active runway seconds before touchdown.

The National Transportation Safety Board (NTSB) has recovered both the cockpit voice recorder and flight data recorder. Officials confirmed the devices are intact and are being analysed in Washington, DC to reconstruct pilot-controller communication and flight conditions.

Investigators plan to interview the air traffic controller on duty, who was reportedly handling another emergency involving a United Airlines flight at the sa...