Beach-goers on both U.S. coasts fell victim to shark attacks during the Memorial Day holiday weekend, which marks the unofficial start of summer.

A 13-year-old boy on Neptune Beach in Florida was bitten on his lower right leg by a shark on Sunday, the same day a woman in Newport Beach, California was bitten on her torso and arms, Reuters reported, citing police reports.

The boy was transported to a nearby hospital with non-life-threatening injuries, ABC News reported. The woman, who was bleeding heavily, was conscious and breathing when she was taken to the hospital, but her condition is not known, the Associated Press reported.

Read more: Shark Attacks Reach New High in 2015

George Burgess, director of the International Shark Attack File at the University of Florida, said shark attacks are expected to reach an all-time high this year, according to Reuters.

“I don’t think there’s a whole lot of doubt that these will be considered unprovoked shark attacks,” Burgess said in the Reuters interview. “These are entirely predictable things just as you can predict drownings or car accidents as a result of this being a huge holiday weekend.”