NEW : The Pakistani Taliban claim they are behind Karachi 's bombing . Pakistan has been on high alert because of the two-day holiday of Ashura , in which believers mourn the death of a key imam from the 7th century . 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 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 .