3 shark attacks off Sydney in just over 24 hours; man, boy in critical condition

Three shark attacks in 24 hours leave a man and a 12-year-old critically injured and another boy unharmed at Sydney beaches. Here’s what we know.

Man dies in shark attack at Sydney beach

A man in his 50s was killed by a large shark while surfing at a beach near Sydney, Australia on Saturday.

VIDEO: Florida shark, stingray get into tussle off the coast of Panama City Beach

WATCH: A shark and stingray engaged in quite the tussle last month off the shore of Panama Beach in Florida. A woman was able to capture the moment on camera.

‘F--- this!’ Terrified kayaker stalked by great white shark

A kayaker captured the terrifying minutes that he was stalked by a great white shark. “F—, how do I get him to leave me alone? Please leave me alone, bro."

Largest shark ever tagged by research group spotted off Florida coast

Researchers are tracking what may be the largest male white shark ever tagged by OCEARCH, with recent signals coming from off Florida's east coast near Jacksonville.

Florida surfer survives near-fatal shark attack at same beach, 12 years after first bite

This wasn't Cole Taschman's first brush with a shark. Twelve years prior, he had been bitten by a smaller shark while surfing in the same exact spot at Bathtub Beach in Stuart, Florida.

Scuba divers have 'once-in-a-lifetime' close encounter with great white shark near Catalina

Scuba divers near Catalina had a rare and thrilling encounter with a 15-foot Great White Shark, capturing the moment on video as the shark calmly circled them before swimming away.

Teenager bitten by shark during lifeguard training
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A teenager was bitten by a shark in Florida while training to be a lifeguard. He is the latest victim among several people who have bitten by sharks in the same Florida county.

Shark attack off Hawaii's Oahu island leaves woman seriously hurt

Also Friday, reported back-to-back shark attacks led authorities to temporarily close beaches to swimmers in Walton County, on the Florida Panhandle.

Florida beachgoers help get distressed, stranded shark back into the ocean

A mako shark that was stuck on a Pensacola, Florida beach was sent back into the ocean by beachgoers who worked tirelessly to free the predator.

NYC shark bite victim had 5 surgeries, has been left with permanent disability, daughter says

The daughter of the 65-year-old woman who was bitten by a shark at a New York City beach says her mother has undergone five surgeries since the attack and will require more.

Drug-addicted 'cocaine sharks' may be devouring dumped drugs off Florida coast

Thousands of sharks off Florida's coast may have ingested bales of cocaine left in the water by drug smugglers attempting to get their product into the United States.

Video shows large shark swimming eerily close to people at Florida beach: 'That sucker came close!'

Swimmers at Navarre Beach in Florida got quite a surprise over the Fouth of July weekend when a large shark was swimming in the ocean alongside them. Video shows people quickly getting out of the water.