The worker told police he found a suspicious package under a car while cleaning a street in the Bayrampasa neighborhood about 2 a.m.
He gave the package to police officers on patrol on the area, who then summoned the bomb squad.
The vehicle under which the bomb was found belonged to a security officer, police said, adding that a large number of police officers live in the neighborhood.
Notable deaths of 2014 [PHOTOS]
U.N. investigator: prosecute North Korea