The Pakistan Taliban claimed responsibility for a Friday attack on a Shiite Muslim mosque in Peshawar in northwestern Pakistan — a suicide bombing and gunfire assault that a hospital representative said killed 19 people. The Islamist militant group said the attack was orchestrated by a commander who was behind December’s massacre of 145 people, including 132 children, at a Peshawar school. Sixty-seven people were injured Friday, said Tauheed Zulfiqar, a representative of the Hayatabad Medical Complex in Peshawar. The Pakistan Taliban attacked the mosque, spokesman Muhammad Khurasan said in an email to CNN, as revenge for the government’s December 19 execution of a militant who was allied with the group.