At least three persons died and twelve including women and children were injured in a car bomb blast in a thickly populated Berisco area at Kashkal. The blast also hit a passing-by school bus. Ambulances and relief teams have reached the scene of incident and the twelve injured were rushed to the Lady Reading Hospital here, where emergency has been declared. Bomb disposal squad and the police have arrived at the scene, while the security persons have besieged the area. Several cars have also been damaged, while electricity system was also blown up. Sources said that police have taken into custody three persons from the scene of incident. A bomb killed four people in Pakistan's northwestern city of Peshawar on Saturday, police said. The bomb went off near a school bus in the busy Kashkal area of the city. "Four people were killed in the explosion," city police chief Sefwat Ghayour said. Another police official Gohar Rehman also confirmed the incident and the death toll, saying "Four people including a woman, two children and a male were killed in the explosion".