U.S. Coast Guard (USCG) marine investigators are working to determine what caused the grounding of the 920-foot, double-hulled liquefied natural gas (LNG) tanker Matthew on Tuesday, USCG said late Tuesday morning.

The Norwegian-flagged tanker grounded at 6:15 a.m. and was later refloated Tuesday morning, approximately a half nautical mile southeast of Cayo Caribe near Guayanilla, Puerto Rico. There were no reports or sightings of pollution.

The vessel was refloated when the crew transferred cargo from the vessel’s forward tanks to its aft cargo tanks, allowing the vessel to float free. The Matthew is moored at the Eco Electrica facility, where underwater hull integrity assessments are scheduled to be conducted by contract divers.

Sector San Juan Coast Guard command center controllers were alerted Tuesday morning after receiving a report that the vessel had grounded onto rocks during its inbound transit to Guayanilla.

USCG marine inspectors and pollution investigators from Regional Inspection Office Ponce and Sector San Juan are providing support on scene. USCG controllers launched a helicopter crew to assist.

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