Malaysia Airlines flight returns to Melbourne after passenger tries to enter cockpit

By A. Ananthalakshmi and James ReganKUALA LUMPUR/SYDNEY (Reuters) - Passengers and crew on a Malaysia Airlines flight from Melbourne to Kuala Lumpur tackled a fellow passenger who attempted to enter the cockpit shouting he had a bomb, authorities and witnesses said on Thursday.The 25-year-old man, a Sri Lankan national, was tied up with seatbelts and the flight diverted back to Melbourne following the incident shortly after takeoff late on Wednesday.Arif Chaudhery, a passenger on board MH128, to