Several employees suffered injuries at Frankfurt Airport after a Lufthansa Boeing 787-9 nose landing gear retracted while parked at a gate.The aircraft was being prepared for a flight to Los Angeles when the landing gear suddenly collapsed and caused the plane to tip forward.Ground staff and crew members present on the jet received medical treatment following the unexpected failure of the landing mechanism.Lufthansa initiated an investigation into the cause of the collapse while technical teams worked to clear the gate and assess the damage.