From the Massachusetts State Police:
VIDEO: Shark Spotted by Air Wing, Beachgoers Warned by Crew via P.A.
Video of shark spotted by Troopers Fairchild and Boulos, who are assigned to the Air Wing. They also had Provincetown Police Officer Rich Alves on board when they all spotted the shark about 30 yards off the Race Point Beach in Provincetown. They alerted beachgoers using the helicopters P.A. system to exit the water due to the proximity of the shark to the shore.