An oil spill off the island nation of Trinidad and Tobago has fouled local beaches and is now drifting toward Grenada and Venezuela, officials said Thursday.

The spill, discovered on Feb. 7, was at first a mystery . Trinidad and Tobagos Coast Guard saw oil in the water and traced it to a capsized barge with no crew or indication of where the vessel came from. The slick quickly covered nearby beaches along Tobagos southwestern coastline as the ship continued to leak fuel.

Authorities later said the barge was being tugged from Panama to nearby Guyana before some sort of accident took place. Its unclear who owns the vessel or if anyone was aboard or injured when it sank.

Its also unclear how much oil has already leaked or how much more the barge contains.

Tobagos chief secretary, Farley Augustine, told Reuters this week the slick had entered Grenadas waters. Tobago has attempted to address the leak but has been unable to do so as the vessel is dangerously bobbing in the water.