Emergency workers in Trinidad and Tobago are racing to clean up a massive oil spill after a mystery vessel ran aground near the Caribbean island, casting a pall over Carnival tourism. The spill was "not under control" as of Sunday, said Prime Minister Keith Rowley, who added that the country is grappling with a national emergency. The mystery vessel capsized Wednesday in waters off the Caribbean island, having made no emergency calls, with no sign of crew, and no clear sign of ownership.