Indonesia opposed the formation of Malaysia due to its own claims over Borneo and launched ''Konfrontasi'' (Confrontation in Indonesian) in response to the formation of Malaysia. On 10 March 1965, a bomb planted by Indonesian saboteurs on a mezzanine floor of MacDonald House exploded, killing three people and injuring 33 others. It was the deadliest of at least 42 bomb incidents which occurred during the confrontation. Two members of the Indonesian Marine Corps, Osman bin Haji Mohamed Ali and Harun bin Said, were eventually convicted and executed for the crime. The explosion caused US$250,000 () in damages to MacDonald House.