PESHAWAR, Pakistan — A suicide bomber struck a funeral on Tuesday in the city of Mardan in northern Pakistan, killing 28 mourners, including a provincial legislator, and injuring more than 60, a senior police officer said. Connect With Us on Twitter Follow @nytimesworld for international breaking news and headlines. Twitter List: Reporters and Editors “It was terrible,” said Jafar Khan, the deputy police inspector general in Mardan, about 40 miles northeast of Peshawar, capital of the volatile Khyber-Pakhtunkhwa Province. “We had to make our way through piles of human flesh.” The attack took place during the funeral of an…