At least three great white sharks were spotted off the coast of Cape Cod on Tuesday by the Massachusetts Shark research team.

The Sharktivity Map and application, designed by a team of Cape Cod officials and wildlife researchers, reports three great whites were spotted on Tuesday. Two were identified off the coast of Provincetown and one other off the coast of Chatham.

Off the Chatham coast, researchers found James, a white shark previously identified by their team. Great whites migrate north toward New England during summer months, and many land in waters off the Cape.

Last week, on Friday, June 22, researchers said blood was found in the waters off Eastham, prompting a one-hour closure of the beach there.

Gregory Skomal, a shark scientist from the Massachusetts Marine Fisheries Department, has tracked about 120 sharks with acoustic transmitters that ping researchers when one is close. The Sharktivity smartphone and online app is able to tell users when researchers identify a shark nearby so they can take precautions.

Groups like the Atlantic White Shark Conservancy warn users to not swim near seals, swim close to shore in shallow waters, avoid swimming alone and at night, and to learn a beach's alerts and flag-warning system.