Police officials said the suspect, Shoaib, has confessed to murder a traffic police officer for charging fine on violation of traffic law. He was also involved in murder of an official of Special Security Unit, they said.
The suspect has confessed to killing a woman after breaking into her house for just Rs5,000. He has also killed sector in-charge of a political party.
The Karachi police officials said the suspect has already served terms four times in jail, while he is wanted in four other criminal cases as well. Interrogation of Shoaib has been underway which is likely to lead towards more confessions, they added.