At least four people were killed in Bangladesh's southeastern seaport city Chittagong when a train plunged into a mini-bus at an unmanned railway crossing on Tuesday morning, police said.

Over a dozen people were also injured in the accident in Chittagong, some 242 km southeast of capital Dhaka, at about 7:40 am local time, said the police official.

The official who did not like to be named said the mini-bus had been carrying mostly garment workers who were going to their workstations in the morning.

According to the police official, the train bound for capital Dhaka rammed into the mini-bus which was crossing the unmanned level crossing.

There are many unmanned level crossing along the Bangladesh Railway across the country, where most tracks of the railway are in a dilapidated condition, which often cause similar accidents.