Several news outlets Thursday reported at least three shark attacks at South Padre Island, described as “extremely rare,” that left as many as three victims hospitalized after swimming in shallow waters before officials cleared out Fourth of July revelers Thursday.

ABCNews.com reported four people are believed to have been bitten by the same shark on the Fourth of July while in waters off the southern coast of Texas, officials said.

Texas Game Warden Capt. Chris Dowdy told ABC Weslaco, Texas, affiliate KRGV that the four separate shark bite incidents were reported off South Padre Island.

In one of the incidents, the South Padre Island Police Department said it received a call reporting a “severe” shark bite to the leg at around 11 a.m. local time Thursday near the 4100 block of Gulf Boulevard.

In a story posted on myRGV.com, from about late Thursday morning to about 12:30 p.m., at least one shark attacked up to three victims within South Padre Island’s city limits, Art Hurtado, chief of Cameron County’s beach patrol, said Thursday.

At about 11 a.m., South Padre Island police officers and firefighters were treating a man suffering “a severe shark bite to the leg” off the 4100 block of Gulf Boulevard before rushing him to a hospital, Nikki Soto, the Island’s spokesperson, said in a statement.

By about 12:30 p.m., officials had responded to two more attacks, Hurtado said.

“It’s extremely rare,” he said of shark attacks along the Island’s shallow coastline. “This is very unusual, especially for this area.”

At about 2 p.m., a Texas Department of Public Safety helicopter and boat were tracking a shark, while officials warned revelers to stay out of the waters, Hurtado said.

At about 3 p.m., he spotted the shark, describing it as about 5 to 6 feet long, off Isla Blanca Park, he said.

”Currently, the South Padre Island Beach Patrol, fire and police departments (are) patrolling the shoreline and utilizing drones,” Soto said at about 3:30 p.m.

Hurtado said the attacks marked the most serious shark bites he’s handled.

“It’s a very rare occurrence,” he said. “It’s not in the ecosystem.”

About four years ago, a shark left a swimmer with “minor, minor injuries” in the area, he said.

Nereyda Bazaldua of Harlingen told the Valley Morning Star on Thursday that her daughter was one of the several people attacked, but was not seriously injured.

“We didn’t even know of the first (shark attack),” Bazaldua said via Facebook. “It could have been worse. But grateful that the shark just scratched her leg with his teeth.”

Newspaper archives from The Brownsville Herald show that there was a fatal shark attack on the Island around 1:30 p.m. Sunday, Aug. 19. 1962.

According to the archives, a McAllen machinist named Hans Fix died at Brownsville Mercy Hospital less than three hours after being attacked by a shark “while fishing 150 yards off Andie Bowie Park.”