Two pilots were left stunned when their passenger jet was involved in a near-miss with a large drone.

They spotted the gadget, which had multiple arms and up to eight rotors, on the approach to Heathrow Airport in west London, the UK Airprox Board (UKAB) said.

They both exclaimed: "Was that a drone? At 10,000 feet!"

There was "no time to react" as they watched the flying object for around five seconds as it passed down the right side of the plane, according to the report.