The search for the presumed white shark that killed a swimmer who was training in the ocean for the triathlon continues over a stretch of Southern California beaches, but authorities found no trace.

Authorities advised swimmers to stay out of the water in the area from north San Diego to Carlsbad, but said numerous people will probably ignore the warning and enter the water to escape the high temperatures.

Authorities sent helicopters to look after the shark that killed triathlete David Martin, according to the statement released by Solana Beach Lifeguard Capt. Craig Miller.

Solana Beach is 14 miles (22.53 kilometers) northwest of San Diego.

The swimmer, a retired veterinarian, was training with three other swimmers when the shark attacked him. The great white lifted Martin out of the water with his legs in its jaws and shred his black wetsuit.

The four swimmers were training at Tide Beach around 7 a.m. when the shark attacked.

The 66-year-old swimmer was the first to die in a shark attack in San Diego County since 1994. The last similar attack in the area occurred in 1959.

San Diego County sheriff's Sgt. Randy Webb was the one who said that it might have been a white shark. He reached that conclusion after inspecting the injuries made by the shark on the swimmer’s thighs.

"It looks like the shark came up, bit him, and swam away," said Solana Beach Deputy Fire Chief Dismas Abelman.

Shark attacks are a rarity according to a study of the University of Florida. The study shows that last year there were only 71 cases all around the world and only one has ended with the death of the victim.