At least 20 people were killed and dozens more injured as an explosion ripped through a Shiite mosque Sunday in Pakistan's eastern province of Punjab, a police official said, according to dpa.
A suicide bomber blew himself up at the main entrance of the mosque in Chakwal district when the security guards challenged him.
"It was a suicide bombing. At least 20 people are killed and the number could be as high as 35," a district police officer told Express television. Dozens more people were injured.
More than 1,500 Shiite Muslims were assembled in the mosque when the suicide bomber struck, police said.