Pakistani Taliban suicide bombers attacked the police headquarters of Pakistan's largest city, Karachi, on Friday, The Associated Press reported.

Three security personnel and a civilian were killed and 18 other law enforcers were wounded, according to government officials and the police chief of the southern Sindh province of Ghulam Nabi Memon, where Karachi is located.  

Officials added that two attackers were killed and at least one person blew himself up after entering the police building.

The Pakistani Taliban claimed responsibility for the attack on the police headquarters.