The U.S. Coast Guard is investigating an incident that occurred Sunday night when a cruise vessel ran into a U.S. Navy fuel pier at inner Apra Harbor, the Port Authority of Guam confirmed.

The Nippon Maru cruise vessel, originating from Yokohama, Japan, collided with delta pier as it was departing to Saipan. The 546-foot vessel was carrying 524 passengers and a crew of 224.

The incident was reported around 9:14 p.m. Sunday.

An initial assessment indicated the lower portion of the stern on the starboard side of the vessel was punctured resulting in a gap measuring approximately 5 feet by 7 feet, stated a release from the Port Authority.

The agency is working with the Navy to determine the extent of the damage to the pier.

"The accident is unfortunate, but we are thankful that the passengers and the crew members were not injured," stated Joanne Brown, general manager of the Port Authority.