Pakistani mourners carry the coffin of a blast victim during his funeral in the town of Sehwan in Sindh province, some 200 kilometres north-east of the provincial capital Karachi on February 17, 2017, after a bomb blew up in the shrine of 13th century Muslim Sufi saint Lal Shahbaz Qalandar. Pakistan launched a crackdown Friday after a bomb killed 70 people at a crowded Sufi shrine, officials said, the deadliest in a wave of attacks that analysts said suggested militants could be regrouping. The Islamic State group (IS) has claimed the attack, which came after a series of bloody extremist assaults this week, including a powerful Taliban suicide bomb in the eastern city of Lahore which killed 13 people and wounded dozens. Pakistan launched a crackdown February 17 after a bomb killed 70 people at a crowded Sufi shrine, officials said, the deadliest in a wave of attacks that analysts said suggested militants could be regrouping. The Islamic State group (IS) has claimed the attack, which came after a series of bloody extremist assaults this week, including a powerful Taliban suicide bomb in the eastern city of Lahore which killed 13 people and wounded dozens. The attacks have dented growing optimism in security after Pakistan's decade-long war on militancy. / AFP PHOTO / ASIF HASSAN