At least 49 people killed in bomb blast at Shia mosque in Pakistan moments after Friday prayers

Officials in Shikarpur district, where the blast hit, said the death toll is 49

Police said blast was caused by a suicide bomber or an explosive device

Jundullah, a splinter group of Pakistan's Taliban, claimed responsibility

'Our target was the Shia mosque. They are our enemies,' said the group 

Radical Sunni Islamist groups often target mosques frequented by Shi'ites 

Schism with Shi'ite Islam dates back to a dispute over who should succeed the Prophet Mohammed

Nearly 50 people have been killed after in a powerful bomb blast at a packed Shia mosque in Pakistan moments after Friday prayers.

Police said the blast was caused by either a suicide bomber or an explosive device which went off when the mosque was at its most crowded on Friday afternoon in the centre of Shikarpur, which around 300 miles north of Karachi.

Officials confirmed the death toll from a deadly blast at the mosque is currently 49.