At least 11 people, including four policeman were killed and 21 others injured in a blast at Shuhada Chowk in Quetta today. Police said the blast occurred when police attempted to stop the car of a suspected suicide bomber from targeting its offices on Gulistan Road. <br/><br/>Balochistan Government spokesperson Anwarul Haq Kakar said, the suspected bomber, tried to break a security perimeter to target the police offices but blew up after policemen standing guard attempted to stop him.<br/><br/>Addressing the media, DIG Quetta Abdul Razzaq Cheema also confirmed the death toll and said security officials tried to stop a car near Shuhada Chowk and the blast occurred moments later. <br/><br/>Security forces have cordoned off the site of the blast and are investigating.