Mianwali: Three passengers were killed and two others injured in a collision between car and a trailer on Mianwali road on Friday. According to police, the speeding car hit with the trailer that was about to park at the side of the road near Mianwali. The tyre burst of the car that rammed into the trailer, killing three people and injuring two. The bodies and injured were shifted to the DHQ hospital for medico-legal formalities and treatment. The police have started an investigation into the case.