United Airlines has discovered loose bolts on plane door covers of several of its Boeing 737 Max 9 aircraft.

Checks were ordered after a near mid-air disaster when part of a passenger door blew out of an Alaska Airlines Boeing 737. The flight from Portland, Oregon to Ontario, California, was carrying 177 passengers and crew. It had reached 16,000ft when door cover fell away causing depressurisation of the cabin. The aircraft made an emergency descent and landed safely.

The US authorities grounded all Boeing 737 Max 9 planes following the emergency and the plane maker advised airlines to check for loose bolts.

United Airlines has now discovered loose bolts on at least five of its aircraft. Other airlines are carrying out their own inspections..

Reeta Chakrabarti presents BBC News at Ten reporting by Sarah Smith in Washington.

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