BP investigates new Gulf sheen
Oil giant BP says it is investigating a new sheen in the Gulf of Mexico, but there is no immediate indication it is the result of an oil spill.
A catastrophic explosion in April 2010 at BP's Macondo well in the Gulf killed 11 men and led to the worst offshore oil spill in US history.
A sheen is a shiny coating that floats on the surface of the water, and could come from leaked or spilled oil.
BP did not make clear what the source of the sheen is, but said it was not found near "any existing BP operations".
The company said in a statement the sheen was found near two abandoned exploration well sites in the Gulf and it had sent a "remote-operated vehicle" to examine the underwater wells.
Spokeswoman Sheila Williams said "there is a lot of sheen in the Gulf of Mexico area" and that the substance did not necessarily come from a BP site.