After great white sharks were spotted enjoying a “feast” off of Nantucket along with other reports of shark predations on seals, swimming has been banned at a wildlife refuge.

Sharks were recently seen thrashing in the water off of Great Point Nantucket Island, as the apex predators devoured prey. Blood was spotted in the water.

As a result of the recent shark predation events, a swimming ban is now in place at Great Point, which is located on the northern tip of Nantucket.

“After several shark sightings and predation in the area, we’ve decided to implement a swimming closure around Great Point until further notice,” said Sarah Cassell of The Trustees, a conservation and preservation organization.

“This is not a decision we’ve made lightly,” Cassell added. “Visitors’ safety is our utmost concern, especially given the remote location of this beach should a serious incident occur. We’ll continue to monitor shark activity in partnership with the U.S. Fish and Wildlife Service.”

The swimming closure is in effect in the area beyond mile marker 5 on the wildlife refuge. This is the area where the most recent predation occurred.

On the Fourth of July, a viewer took a video of a shark thrashing in the water off of Great Point, writing in the post, “Sharks having a feast.”

The Atlantic White Shark Conservancy‘s Sharktivity app over the weekend had a report of a shark predation on a seal at Great Point.

“Other areas of the refuge remain open for recreational use,” Cassell said. “We advise that all visitors use caution when in the water.”

Seals are the major prey species for the great white shark. As the seal population has exploded around the region, the great white shark has become more numerous.

Other recent shark sightings along Cape Cod and the Islands include a dead seal with evidence of shark bites off of Provincetown over the weekend.