A cargo ship with 600 tons of stones on board sank in the River Pashur in Bagerhat's Mongla early Thursday, port authorities said. All the 10 crew members on board were rescued by another cargo vessel, the Mongla Port Authority added. The ship MV Master Didar, heading towards Khulna, sank near anchorage area Harbaia-3 around 12am, after it began to take on water and tilt to one side, Captain Md Shahin Mzaid, harbour master of Mongla Port, said. Read more: 13 trawlers sink in Bay in Cox’s Bazar 13 trawlers sink in Bay in Cox’s Bazar A certificate of a survey of Master Didar, which a ship needs to operate as a commercial vessel, expired. Also, no effort to salvage the ship was seen till the filing of this report. The ship owner has been sent a letter to salvage the ship within 15 days and an explanation was sought for operating it without a fitness certificate, Captain Md Shahin said.