Shark attacks, sightings in New York and Florida put swimmers on high alert

A recent surge in shark encounters has raised concerns among beachgoers. 

In New York this week, five shark bites were reported in just two days off Long Island beaches, while in Florida, the tranquility of a Pensacola beach turned into a rush to safety Tuesday as swimmers saw a shark's dorsal fin zipping through shallow waters.

At least 19 shark attacks have been reported in the United States this year.