Islamic State claimed responsibility for a suicide bombing in Pakistan that killed at least 70 people and wounded more than a hundred on Monday in an attack on mourners gathered at a hospital in Quetta, the group's Amaq news agency reported.

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"A martyr from the Islamic State detonated his explosive belt at a gathering of justice ministry employees and Pakistani policemen in the city of Quetta," Amaq said.

The Pakistani Taliban faction Jamaat-ur-Ahrar has also claimed responsibility for the attack.