At least 30 people have been killed and 150 others injured after a bomb exploded inside a Shia mosque, 60km south of the Pakistani capital Islamabad, officials say.
Sunday's blast in the city of Chakwal came a day after eight paramilitary soldiers were killed in a suicide attack in Islamabad.
Rescue authorities are still searching through the wreckage where the explosion occurred during a religious congregation.
Kamal Hyder, Al Jazeera's correspondent in Pakistan, said security officials suspected a suicide bomber behind the blast.
He said the mosque was packed with people at the time of the explosion.
PHOTO CAPTION
Pakistani policemen on guard in Chakwal, some 100 km from Islamabad in 2008.
Agencies