A suicide bomber has killed at least 22 people in central Pakistan today, officials said.
The attack, at a religious centre for minority Shia Muslims, took place in the central Punjab city of Chakwal, about 100 km (60 miles) south of Islamabad.
Regional police chief Nasir Khan Durrani said 22 people had been killed and 35 wounded.
A resident of Chakwal said, around 2,000 members of minority Shia Muslims were gathered for a religious ceremony in the centre when attack took place.
"Some people were going out of the centre when a young man came running into the gathering. As he was stopped, he blew himself up," he added.
The attack came a day after a pilotless US drone aircraft killed 13 people including militants in the northwest and a suicide bomber killed eight soldiers in Islamabad.
Pakistan is crucial to US efforts to stabilise neighbouring Afghanistan and President Barack Obama has said the release of additional US aid to the nuclear-armed country depends on how it tackles terrorism.
Reuters