The National Transportation Safety Board (NTSB) said key braking systems failed to activate during Sunday's fatal crash of an Amazon Prime Air cargo jet at Miami International Airport, which killed five people. Investigators found that while the wheel brakes were applied, flight data showed no indication that the speed brakes or thrust reversers deployed as the aircraft overran the runway, struck two vehicles and came to rest near a car park. Officials say they are not yet drawing conclusions about what went wrong and still need to interview the pilots to understand how the controls were being operated during landing.

NTSB investigator Chihoon Shin said a full analysis of flight parameters is needed before assessing whether the landing performance was normal. NTSB Chairwoman Jennifer Homendy confirmed the captain, 55, had 7,145 flight hours, while the 37-year-old first officer had 2,655 hours. Officials said there was no hazardous cargo aboard Prime Air Flight 7598, which was carrying mostly contact lenses weighing 32,222 pounds, plus a flight kit; seven of the five fatalities were in a van crushed on airport property, with the plane also striking a further vehicle after breaching the perimeter fence.