Officials in the U.S. Virgin Islands say a shark attack off western St. Croix killed an American woman on Thursday afternoon, in a rare fatal incident that has pushed local authorities to revisit beach safety messaging for visitors.

Police identified the victim as Arlene Lillis, 56, of Detroit Lakes, Minnesota. According to the Associated Press report, the attack happened close to shore on the western side of St. Croix, after which police and emergency crews responded to the beach and worked to treat Lillis before she was taken to a local hospital. She later died from her injuries, Lt. Gov. Tregenza A. Roach said.

Officials said they initially feared there might have been a second victim, but a perimeter search found no one else injured. They also said they had not yet confirmed the species of shark involved. That uncertainty matters because the incident remains under investigation and the local response is still focused on what can be verified rather than speculation.

The attack stands out because officials say shark encounters that lead to bites are uncommon in the territory. Nicole Angeli of the U.S. Virgin Islands Department of Planning and Natural Resources said at a Friday news conference that such incidents are very rare. She added that Thursday’s event was only the second such incident in a decade, underlining how unusual the fatality is for an area where shark sightings may be common but serious attacks are not.

Local agencies are already discussing practical steps. Angeli said there are plans to install more signs and share more information at hotels and beaches on how to stay safe around wildlife. That is one of the few immediate policy responses officials have described publicly, alongside the continuing investigation. Officials are also trying to reassure visitors that the territory’s beaches remain open while the review continues.

Daryl Jaschen, director of the Virgin Islands’ emergency management agency, said crews responded swiftly and professionally under extremely difficult circumstances. He also said investigators could not immediately say what may have caused the shark to come so close to shore. For now, the main facts are limited but clear: a woman was attacked near the beach, emergency responders were dispatched, and she later died.

The broader context is not a spike in local shark attacks, but a territory where authorities say such events remain rare. The Florida-based International Shark Attack File has recorded at least 79 unprovoked shark attacks in the Caribbean since 1749, including four in the U.S. Virgin Islands, according to the AP account. That history gives a sense of scale without changing the central fact of this case: a deadly attack in a place where officials say it is highly unusual.

The investigation is ongoing, and the absence of a confirmed shark species means officials are still working from the earliest version of the event. Until that changes, the focus in St. Croix is likely to remain on public warnings, beach awareness and a careful accounting of what happened offshore on Thursday afternoon.