At least seven people were killed and 20 injured when a local passenger train collided with a goods train in Chennai's northern Vyasarpadi Jeeva suburb on Wednesday. Railways Minister Lalu Prasad said an inquiry will be conducted into the incident.

"An unidentified, unauthorised person operated the local train with 35 passengers from Chennai Central Rail Terminal around 5 am and rammed it into a stationary goods train at the northern Vyasarpadi suburb," a Southern Railway spokesperson said.