A powerful explosion has killed more than 50 people in Kabul. An official said the blast hit the Khalifa Sahib Mosque as worshippers gathered for Friday prayers. It's the latest in a series of attacks on civilian targets in the country during the Islamic month of Ramadan. It's not immediately clear who's responsible. But the head of the mosque said, a suspected suicide bomber could have joined in the ceremony and detonated explosives. Zmaryalai Abasin reports.