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Mariners are rais­ing en­vi­ron­men­tal con­cerns af­ter a slick es­ti­mat­ed to stretch up to two miles long and half a mile wide was spot­ted float­ing in the Gulf of Paria, south of Port-of-Spain, on Sun­day.

Wit­ness­es be­lieve the sub­stance was diesel mixed with oil residue, pos­si­bly dumped from a ves­sel.

Tour op­er­a­tor Navin Kalpoo said he en­coun­tered the north­ern edge of the slick while con­duct­ing a bird­watch­ing tour in the man­groves off Ca­roni.