NEW : The Pakistani Taliban claim they are behind Karachi 's bombing . Shiite Muslims have been celebrating the sacred holiday of Ashura . The Pakistani Taliban claimed responsibility for an earlier fatal bombing . The terrorist group has continued to attack the Ashura processions across Pakistan .
NEW : The Pakistani Taliban say they are behind Sunday 's bombing . Shiite Muslims have been marking the sacred holiday of Ashura . The Pakistani Taliban claimed responsibility for an earlier fatal attack . The terrorist group has vowed to attack Shiite Ashura processions across Pakistan .