ISLAMABAD - An explosion ripped through a police bus on the edge of Peshawar on Friday, killing at least 19 people and wounding dozens in the deadliest attack in months in the northwestern city.

The provincial information minister, Mian Iftikhar Hussain, said the bus was traveling to Charsadda, carrying private passengers and employees of the Khyber Pakhtunkwa government, when a bomb went off.