A suicide bomber killed at least 31 people and injured nearly 170 others at a Shia mosque. According to police reports, the attacker targeted the congregation during prayers. Eyewitnesses told the BBC that they heard gunfire just before the blast went off. Nearby hospitals were quickly overwhelmed with victims, prompting officials to declare an emergency and issue an urgent call for blood donations. Caroline Davies, the BBC's Pakistan Correspondent, visited the mosque in Islamabad shortly after the attack to survey the damage.