Two dead whales have washed up on the same stretch of Bangladesh coastline in two days, officials said Saturday, raising suggestions that they were killed by sea pollution. Officials said the second, much longer whale washed up on Himchhari Beach, outside the resort city of Coxs Bazar, at around 8:30 am (0230 GMT) Saturday, just a day after the carcass of another Brydes whale was found two kilometers (1.25 miles) from the spot. "The carcass of the whale found today is at least 50 feet (16 meters) long and 10 feet wide. It weighs three-four tonnes," Jahirul Islam, executive director of the Coxs Bazar-based Marine Life Alliance, told AFP. Islam said the whales could have been killed in a collision with a ship plying the Bay of Bengal, or have died after eating plastics which litter the sea. "Primarily we think the two have died from consuming plastic and polluted objects. There is an injury mark on the back of the second whale. We suspect it could have been hit by a high-speed vessel," Islam said. Mohammad Shahidul Alam, a professor at the Institute of Marine Science and Fisheries, said parts of the Bay of Bengal are seriously polluted, and that could have led to the animals demise. A spokesman for Bangladeshs environment and forestry department said its researchers had collected samples from the carcasses for post mortem examinations. Two similar whales also washed up on Coxs Bazar beaches in 1996 and 2006.