At least 12 others injured in explosion.
A blast killed three boys aged between 10 and 12 at a madrassah in Karachi on Monday, police said.
The attack targeted the Tahiri madrassah in the impoverished western district of Orangi, which has a militant presence and a history of sectarian violence.
“The explosion, which targeted a Sunni madrassah, killed at least three male students and wounded six others,” said a senior local police official, Javed Alam Odho. He said the police were trying to ascertain whether it was a planted bomb or a hand grenade that had been thrown.
A senior doctor at the Abbasi Shaheed hospital, Parshotum Rathore, confirmed the number of deaths and said those who died in the attack were aged between 10 and 12. He put the number of injured at more than 12 and said the condition of four of those hurt was critical.
Nobody has so far claimed responsibility for the attack.