SOLANA BEACH, Calif. (AP) -- Authorities in California say a man swimming in the ocean with a group of local triathletes off San Diego County has been attacked and killed by a shark.
Authorities in Solana Beach say the man was 66 years old. He was taken to a lifeguard station for emergency treatment but was pronounced dead at the scene.
A statement from the San Diego County sheriff's department says the shark is believed to have been a great white.
A lifeguard says the attack took place about 150 yards offshore. He says two swimmers were about 20 yards ahead of the man when they heard him scream.
Swimmers were ordered out of the water for a 17-mile stretch around the attack scene and authorities sent helicopters up to scan the waters for the shark.
The lifeguard says the beaches could remain closed for 72 hours.
(Copyright 2008 by The Associated Press. All Rights Reserved.)