Five security personnel and a driver were injured in a blast set off by Maoists in Chhattisgarh's Bijapur today. The Maoists set off an Improvised Explosive Device or IED on a truck at around 9 am, the police said. Bijapur was among the 18 constituencies that voted in the first phase of the assembly elections in Chhattisgarh on Monday. No polling officials was nearby during the incident.