Truro Police announced on Friday night Long Nook Beach will remain closed to swimming until further notice due to continued shark activity.
Recent shark sightings and even a shark attack on a man have prompted many beaches along the Cape to be on high alert.
Shark sightings have become commonplace along Cape Cod since the beginning of summer, but recent sightings have some experts on edge.
On Wednesday, a shark bit a 61-year-old New York man on the torso and leg just 30 yards away from the shore. He is currently being treated at Tufts Medical Center and is expected to survive.
After the attack, more sharks were spotted along the Cape, prompting temporary closures to other beaches.
According to the Cape Cod National Seashore, a shark was seen in the waters off Race Point Beach in Provincetown Thursday afternoon. Video shows the shark feeding on a seal near the shore.
Meadow Beach in Truro was closed earlier in the day when several sharks were spotted in the water.
Despite the public's primal fear of sharks, the odds of being killed by one are roughly 1 in 3.7 million, according to the National Aquarium in Baltimore.
Truro was the site of the last shark attack in Massachusetts, in July 2012, when a Colorado man on nearby Ballston Beach suffered a bite that required 47 stitches. The state's last shark attack fatality was in 1936.