Air India Flight 182 was an Air India flight operating on the Montreal, Canada–London, UK–Delhi, India route. On 23 June 1985, the Boeing 747-237B serving the flight (c/n 21473/330, registration VT-EFO, "Emperor Kanishka") was destroyed by a bomb at an altitude of 31,000 feet (9,400 m). It crashed into the Atlantic Ocean while in Irish airspace. It was the first bombing of a 747 jumbo jet. A total of 329 people were killed, including 268 Canadian citizens, 27 Britons, and 24 Indians.[1] The majority of the victims were Canadian citizens of Indian ancestry. The incident was the largest mass murder in Canadian history. It was the deadliest terrorist attack involving an airplane until the September 11, 2001, attacks.[citation needed] It is also the deadliest aircraft bombing.[2] The bombing of Air India 182 occurred at the same time as the Narita Airport bombing. Investigators believe that the two plots were linked, and that those responsible were aiming for a double bombing. However, the bomb at Narita exploded before it could be loaded onto the plane.