PESHAWAR - At least three persons were killed and 19 others, mostly women and children, injured when a suicide bomber blew himself up in front of a house located at Dalzak Road in Momin Town area on Sunday evening. According to eyewitnesses, the killed persons were passers-by. AFP adds: The attacker blew himself up outside the home of a brother of Mubeen Afridi, spokesman for Taliban-linked extremist group Ansar-ul-Islam, who was killed in a remote-controlled blast on Saturday night. Sundays blast struck the residential neighbourhood of Momin Town in the centre of Peshawar, a hub of militant activity. There was a man who came in Momin Town and opened fire on a house, senior Peshawar police official Sefwat Ghayour told AFP.There was retaliatory fire from the house, and in the crossfire, the suicide bomber blew himself up. In the suicide blast, two ladies and one man were killed and 15 are injured. Among the 15 injured, four are children. Police officials said that the dead and injured were passers-by, with no one in the targeted home killed. Afridi was killed along with his driver on Saturday when a remote-controlled bomb exploded in a car in Peshawar. Police said they suspected rival militant group Lashkar-e-Islam was behind that bombing. Both groups operate out of the lawless Khyber tribal district which sits between Peshawar and the Afghan border. There has been a lull in bombings, however, since the reported death on August 5 of Pakistan Taliban chief Baitullah Mehsud, and officials say there is intense infighting among the militants over who will succeed him.