Guwahati (Assam), May 16 (ANI): Twelve people were injured in a grenade explosion outside a mall on Zoo road in Guwahati. The area has been cordoned off. Two unknown bike-borne suspects lobbed a grenade on state police troops and fled the spot. An injured person at hospital said, "I was stopped by the police for security check near the central mall, the police asked me for my documents and as soon as he handed it back to me a powerful explosion took place. It was so powerful that I fell down." "The blast took place around 7:45. I've got hurt on my leg as well as neck," he added.