Armed robbers on Tuesday looted Rs 15 million from a post office van parked outside its building in Islamabad's Rawal Town located in the limits of Shehzad Town police station. Police said that six unknown armed men, who were riding on two motorbikes, held the van driver and security guard at gunpoint and snatched cash. Robbers fled from the scene and also snatched gun from the security guard, they said. Soon after the incident police reached to the scene and started search for arrest of armed dacoity.