Gunmen have attacked two mosques of the minority Ahmadi Islamic sect in the Pakistani city of Lahore, killing at least 42 people, officials say.
It is feared the death toll may rise, as both mosques were packed for Friday midday prayers at the time of the attacks, and gunfire continues.
Police are reported to have entered one of the buildings, while a stand-off continues at the second.
Lahore has been the scene of a string of brazen militant attacks.
Gunmen are reported to be holding worshippers as hostages inside the mosque in the heavily built-up Garhi Shahu area.