At least 16 people were killed on Wednesday in a suicide bombing outside a polio vaccination center in the southwestern Pakistani city of Quetta, officials and witnesses said.Thirteen of the victims were police officers, said Syed Imtiaz Shah, a senior official with the Quetta police. He said the officers were there to guard polio workers, who are often targeted by Islamist militants in Pakistan.The attack came on the third day of a vaccination campaign in the province of Baluchistan, of which Quetta is the capital. The bomber, who was also killed, walked up to police officers and detonated what Mr. Shah said amounted to more than 20 pounds of explosives.A spokesman for the Pakistani Taliban, Muhammad Khurrasani, claimed responsibility for the attack on the militants’ behalf. Two civilians and a paramilitary police officer were also killed, and 10 police officers and nine civilians were wounded.

Source: Suicide Bomb Near Polio Center in Pakistan Kills at Least 16 – The New York Times