Dhaka, Feb. 4 -- In a distressing incident that has raised alarm over the state of marine biodiversity in Bangladesh, at least 86 endangered turtles have been found dead along the shores of Cox's Bazar, one of the world's longest unbroken sandy beaches.

Sources said in just last one week, as many as 86 turtles were spotted dead along the Cox's Bazar coastline, with most of them having injury marks on their bodies.

The dead turtles recovered by the Bangladesh Oceanographic Research Institute at a time ranging from January 24 to 30 were mostly olive-coloured or of Olive Ridley species.

Of them, two dead turtles were recovered from Saint Martin's Island on Thursday (January 30).

Mohammad Shimul Bhuiyan, scientific officer at Bangladesh Oce...