Five people sustained serious injuries in a grenade attack and at the result of firing here in Quetta on Sunday. According to police, unidentified men have entered in a house in the area of Barori Chowk on Western Bypass in early morning and attacked the people presented in the house with grenades and opened fire. At the result, five persons belonged to District Bahawalpur, identified as Ghulam Akbar, Bilal, Imran, Nazeer and Irfan were injured and shifted to nearby hospital. One of the injured was reported in the critical condition. The attackers after committing the crime have managed to escape from the scene.