An explosion at a mosque in Afghanistan has killed at least 50 people

An apparent bomb attack on worshippers at a Shiite mosque in the Afghan city of Kunduz killed at least 50 people Friday, in the bloodiest assault since US forces left the country, foreign media reported.

A medical source at the Kunduz Provincial Hospital said that 35 dead and more than 50 wounded had been taken there, while a worker at a Doctors Without Borders hospital reported 15 dead and scores more wounded.

Taliban spokesman Zabihullah Mujahid had earlier said an unknown number of people had been killed and injured when "an explosion took place in a mosque of our Shiite compatriots" in Kunduz.

Residents of Kunduz, the capital of a province of the same name, told AFP the blast hit a Shiite mosque during Friday prayers, the most important of the week for Muslims.