The 463,700-cbf Santa Lucia (built 1999) was pulled free by tugs at 1500 local time (2000 GMT) on the same day.

Triton said there were no injuries to crew and no pollution occurred.

"The exact cause of the incident is yet unknown. A full investigation into the cause will follow," it added.

Santa Lucia has sailed under its own power to Big Stone Anchorage for a US Coast Guard safety inspection.

It