QUETTA - Four people, including a traffic sergeant, were killed and 18 others seriously injured in rocket attacks in the provincial capital Wednesday evening. Official sources said militants fired three rockets from an undisclosed location west of Quetta. The rockets hit different parts of the city. One rocket landed at Sariab Patak, a busy area of the city close to private residence of Chief Minister Nawab Aslam Raisani, and resulted in instant death of four people, including Safdar Hussain, a traffic sergeant, Asmatullah, Zia-ul-Haq and Muhammad Sadiq, while 17 others suffered serious injuries. Soon after the rocket blast, police and Edhi ambulances rushed to the site and moved injured and dead to Civil Hospital, Quetta where condition of eight was stated to be serious. A car and a rickshaw were badly damaged and the windowpanes of nearby buildings were shattered. An eyewitness, Ainuddin Khan, told The Nation: My brother along with his family was passing through Sariab Patak when a splinter hit the windscreen of his car, causing injuries to him and three other women. The second rocket landed at the gate of a house near Chaman Patak, while the third exploded in an open place in Khaliqabad area. Unidentified people fired rockets from west of Quetta, Deputy Inspector General of Police (Operation) Hamid Shakeel said. No group has claimed responsibility so far. Meanwhile, the train service between Quetta and other parts of the country was suspended because of damage to rail track in the Mangoli area of Jafarabad district, 400km from Quetta. Official sources said unidentified people planted a device that exploded with huge explosion when Rawalpindi-bound Quetta Express was passing. Four bogies of the train derailed in the blast. No loss of life or injuries were reported. Sources said inter-provincial train service from Quetta has been suspended. Law enforcement agencies rushed to the site and cordoned off the area.