Oil leaking from stricken cargo ship off Gibraltar
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The carrier -- the OS 35 -- has been beached in the Bay of Gibraltar since the two vessels collided late on Monday off the territory located on the southern tip of the Iberian peninsula.
No one was injured in the accident. The 24 crew members of the carrier were evacuated.
A boom -- a temporary floating barrier used to contain an oil spill -- had been placed in the area of the collision.
In a separate statement, it added the leak "is fully under control".
Police also said they had detained a person believed to be connected with the accident, without providing any details about the identity of the person or their possible role.
The collision happened when the OS 35 was moving to exit the Bay of Gibraltar.
Bulk carriers are vessels dedicated to transporting solid goods, such as grain, and the fuel on board is that used by the ship itself.
The liquefied natural gas tanker suffered no significant damage.
Gibraltar's busy port has been mostly closed since the accident.
The territory, measuring just 6.8 square kilometres (2.6 square miles), overlooks the only entrance to the Mediterranean from the Atlantic Ocean, putting it on the shipping route to the Middle East via the Suez Canal.