Harpswell, a coastal town in southeastern Maine, was the site of Maine’s first deadly shark attack five years ago, which claimed the life of Julie Dimperio Holowach, 63, a seasonal resident.

As Americans flock to beaches at the peak of summer, a spike in shark sightings is prompting new safety measures. Officials say cleaner water is bringing in more bait fish who attract more sharks. NBC’s Jesse Kirsch reports for TODAY.