A bombing at the Khadija Al-Kubra mosque in Pakistan's capital killed at least 31 and injured 169 during Friday prayers. Investigations are ongoing to determine if it was a suicide attack, with possible suspects including the Pakistani Taliban and Islamic State. Officials, including President Zardari and Prime Minister Sharif, condemned the attack and called for medical assistance for the wounded. The incident raises concerns about security in Islamabad, which has seen a rise in extremist violence recently.