Militants on Tuesday exploded a powerful bomb in a market area here, injuring five persons and damaging a school building. The IED, planted near Bheirodan Hindi High School in the market which is one km away from the official residence of chief minister Okram Ibobi Singh, exploded at around 6 am through a remote-ntrolled device. Five persons were injured, one vehicle was destroyed and the school building damaged in the incident.