There have been numerous shark sightings already this summer.
The most recent sighting was Saturday off of Duxbury Beach in Massachusetts.
A woman on vacation tells NBC10 Boston she saw a shark hanging in the Duxbury Beach area close to the shoreline, so she called the Duxbury Harbormaster.
The Duxbury Harbormaster says the area was searched by officers following the call but it came up negative.
He added that the woman had described a basking shark.