On Thursday, 17 great whites congregated off Monomoy National Wildlife Refuge in Chatham, Atlantic White Shark Conservancy president Cynthia Wigren said late Friday afternoon, following an update from biologist John Chisholm of the state’s Shark Research Program.
Two Cape Cod beaches were forced to close Wednesday
Witnesses saw an “explosion of water and blood” when a great white shark mauled a seal about 30 yards off the beach.