A third bomb on a timer was set to go off before suicide bombers blew themselves up at two hotels in Jakarta last week but malfunctioned, police said on Friday.
The device - a laptop filled with explosives and bolts - was found on the 18th floor of the J.W. Marriott and was supposed to go off first, the national police said.
The explosion would have sent panicked crowds fleeing to the ground floors, where the two suicide attackers detonated their explosives packs.
Last Friday's near simultaneous explosions at the J.W. Marriott and Ritz-Carlton killed seven people and wounded more than 50.
Third Jakarta bomb found
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