Several staff members were injured after a Lufthansa Boeing 787-9 Dreamliner tipped onto its nose at Frankfurt Airport on Thursday, the German airline said.

The incident occurred at 12:45 p.m. (1045 GMT) just before passengers boarded the plane, which was scheduled to fly to Los Angeles.

Luftahnsa said the aircraft "unexpectedly" retracted while it was parked, causing the nose of the plane to fall several meters to the ground and breaking off the door flaps of the nose gear bay.

Cabin crew and ground staff were on board and several were injured and received medical treatment, the airline said.

Another Lufthansa spokesperson said later on Thursday that the wounded, which included two of its crew members, sustained only light injuries.