The Coast Guard says a nearly 10-mile-long ribbon of red tide has been spotted in New York Harbor.
The naturally occurring reddish brown algae bloom stretches from the area near the Intrepid Sea, Air & Space Museum off Midtown Manhattan's West Side to Hoffman Island, off Staten Island. Another patch was spotted about three miles south of Long Island's Jones Beach Inlet.
The Coast Guard say swimmers and boaters should avoid contact with the reddish-brown sheen; it can cause skin and eye irritation, and breathing problems. Red tide can occur in coastal areas when the seas are warm.