In Assam,  at least three persons were killed and as many injured when a passenger bus and a pick up van collided head-on in Goalpara district in the wee hours today. <br />'' <br />'' Police said the driver of the bus and a passenger were killed at the site of the accident on National Highway 37 at Baniapara under Dhupdhora police station area. Another passenger succumbed to his injuries in hospital.