While the waters were closed to swimmers on Sunday, it did not stop holiday revelers from spending the day on the beach.
"We are leaning toward a side of caution in the safety of our tourists and our residents," Leo Dunn of Chatham Beach Patrol said.
Meanwhile, state shark officials were still excited about a first-time feat pulled off on Saturday.
A crew from the state's Division of Marine and Fisheries electronically tagged two great white sharks off Chatham, a first for great whites in the Atlantic Ocean.
Officials said the swimming ban will be re-evaluated no earlier than Tuesday.
