NASSAU, Bahamas (AP) -- An American man attacked by a shark during a spear-fishing trip was listed in serious condition Friday.

Richard Horton, 58, was spearfishing in Abaco Island's Bakers Bay when a shark bit his right leg Wednesday. He was airlifted to New Providence Island in the Bahamas and underwent surgery, hospital officials said.

Horton, of South Orange Park, Fla., was the second man attacked within a week in Abaco, 100 miles north of Nassau.

Benjamin Brown, 39, of Juno Beach, Fla., was bitten last week while spear-fishing with his brother in Walker's Cay. He was airlifted to a hospital in West Palm Beach, Fla., where doctors performed reconstructive surgery on his left calf.