Kolaghat: A head on collision at the National Highway at Kolaghat resulted in the death of a biker. It was reported that he collided head on with an over speeding bus on Friday. The biker had died on the spot. There was huge disturbance created by the locals of the area. The police had reached the spot to bring the situation under control. As per latest reports, the police has intervened and made the mob disperse but an underlying tension still prevailed at the spot.