A shark reportedly injured 4 people in the waters off South Padre Island on July 4

Four people were reportedly injured by the same shark while in waters off the southern Texas coast on July 4, authorities said.

Texas Game Warden Capt. Chris Dowdy told ABC Weslaco, Texas, affiliate KRGV that four separate incidents involving the shark, including two bites, have been reported off South Padre Island.

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

First responders from the South Padre Island Police and Fire Departments provided treatment at the scene before the man was transported to Valley Regional Medical Center in Brownsville, police said.

Footage filmed by a swimmer who witnessed the incident shows a shark swimming close to the shore near the scene of the attack.

A second person was bitten by the shark, while another was grazed and another injured while fending off the shark, Dowdy told KRGV.

The second bite victim was also taken to Valley Regional Medical Center in Brownsville. One of the two victims was flown to “receive additional care,” police said Thursday night.

Authorities had previously said four separate shark bites had been reported before later clarifying the nature of the incidents.

The shark escaped into open waters and there are no plans to contain it at this time, Dowdy told the station.

The South Padre Island Beach Patrol, along with fire and police departments, were patrolling the shoreline and using drones, police said after the attack Thursday morning.

“Shark encounters of this nature are not common in Texas,” authorities said in a statement. “When sharks do bite, it is usually a case of mistaken identity by sharks looking for food.”

Authorities have advised swimmers to watch for “large schools of baitfish close to shore,” which usually indicates a predator is nearby. If you see a shark in the water, calmly exit the water and wait for the predatory wildlife to pass by.

This story has been updated.