Three shark attacks have rocked Sydney, Australia, in a 24-hour period … leaving one boy fighting for his life after losing both his legs to the jaws of one of the ocean predators, and a man in critical condition after his leg was bitten in the water.

The boy was attacked after jumping off a rock ledge into the ocean near Sydney Sunday … after the 12-year-old boy was bitten, some of his friends jumped in after him and swam him back to shore.

Then on Monday, an 11-year-old surfer narrowly missed serious injury when a shark took a giant bite out of his surfboard.

But later Monday, a surfer in his 20s was critically injured when a shark bit one of his legs, News Corp Australia reports. Rescuers performed first-aid on the beach before he was hospitalized.

Watch the video … you can see beachgoers rushing to his aid to pull him out of the water.

The 11-year-old boy had been thrown off his own surfboard when a shark chomped on it multiple times, taking out a chunk of it.

The U.S. Sun reports the boy’s father rescued him after hearing his screams for help.