Dhaka, March 17 -- Railway connectivity between Chattogram and the rest of Bangladesh has been disrupted following the derailment of a passenger train in Cumilla's Nangalkot Upazila.

At least 30 people were injured when nine compartments of the Mymensingh-bound Bijoy Express went off the tracks near the Hasanpur station around 1:35pm on Sunday, according to Nangalkot Police Station chief Debashish Chowdhury.

Five of them are in critical condition.

Initial reports suggest the accident occurred due to the failure of a lock attached to the train's engine.

Trains operating on the route are stranded at various stations as a result of the derailment.

"There have been no fatalities. Railway and local police are responding to the situation,"...