Operation Turkenkreuz, the initial First World War air raid on London, took place on 13 June 1917, when 20 Gotha G.IV bombers attacked the capital. The raid struck a number of sites including Liverpool Street. Seven tons of explosives were dropped on the capital, killing 162 people and injuring 432. Three bombs hit the station, of which two exploded, having fallen through the train shed roof, near to two trains. One of these hit a carriage on a train about to depart, another hit carriages used by army doctors; the death toll at the station itself was 16 dead and 15 injured. It was the deadliest single raid on Britain during the war.