A Bangladeshi cargo vessel returning to the country with fly ash from West Bengal sank in the Hooghly River on Thursday afternoon.
Earlier that day, it collided with a dispatch vessel of the Kolkata Port Trust (KPT).
The Bangladeshi vessel, 'M V Mamatamoy', developed a mechanical failure and a crack in the hull because of the collision, reports Hindustan Times.
It was brought near the jetty at Maheshtala in the Budge Budge area of South 24 Parganas, where it slowly sank along with the cargo.
The crew members were taken to safety. They managed to recover their personal belongings. One of them was injured during the collision.
"The Bangladeshi vessel entered the designated route followed by KPT ships and collided with dispatch vessel 'Ravindra' which was sent to repair some buoys," KPT spokesperson Sanjay Mukherjee told Hindustan Times.
"The KPT vessel was also damaged. The KPT chairman has ordered an inquiry," he added.
Since the vessel which sank was carrying fly ash and also had fuel the spill would lead to pollution, eyewitnesses said.