Authorities are using boats to patrol the ocean and warning swimmers about sharks this weekend along Florida's Gulf Coast, where three people were hurt in two separate shark attacks on Friday.
The attacks off beaches in the Florida Panhandle led authorities to temporarily close several beaches to swimmers on Friday. Beaches were reopened Saturday, with flags warning of high hazards.
In Walton County, the sheriff's office, fire department and the state's wildlife agency were working together to patrol the water with boats and the shore with vehicles, the South Walton Fire District said in an update Saturday. Both of Friday's attacks happened in Walton County.
"Please swim carefully today, respect the Gulf, stay hydrated, and look out for your loved ones," the fire department said on social media.
Red and purple flags were being used Saturday to warn swimmers of the dangers.
"Purple Flags indicate the presence of dangerous marine life and single red flags indicate high hazard conditions," the Bay County Sheriff's Office said in a social media post on Saturday.
Small fish are traveling in schools near the shore this time of year, which might have been a contributing factor in the attacks, the Bay County Sheriff's Office said.
The first attack happened Friday afternoon when a woman was bitten by a shark near WaterSound Beach, the Walton County Sheriff's Office said. She had critical injuries on her hip and lower left arm and was flown to a trauma center, authorities said.
Less than two hours later, firefighters responded to another beach about 4 miles east of the first attack "following multiple reports of a teenager injured by a shark," the sheriff's office said.
Two teenage girls were in waist-deep water with a group of friends when they were attacked, the South Walton Fire District said.
"When lifeguards and deputies arrived on scene, they found one of the females had significant injuries to the upper leg and one hand," fire officials said in an update. She was flown to a trauma center. The other teen had what officials described as minor injuries on one of her feet.
Also Friday, in Hawaii, a woman was seriously injured in an apparent shark attack in the waters off the island of Oahu, officials said.
Shark attacks are rare, according to experts.
There were 69 unprovoked bites last year worldwide, and 10 of those were fatal, according to the University of Florida's International Shark Attack File. That was higher than the recent average of six deaths per year.
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