PIOMBINO, Italy (AP) _ Authorities on Sunday recovered the scuba gear of a diver killed last week by a 20-foot long shark in the Mediterranean, but found no traces of the deadly fish.

Using underwater cameras, authorities located the two air tanks, flippers and a weighted belt that Luciano Costanzo, 46, was wearing when he was attacked on Thursday during a fishing outing off the Tuscan coast.

Port officials said divers retrieved the equipment on the sea bottom, at a depth of about 25 feet. The Italian news agency ANSA reported that the equipment bore holes and lacerations.

The attack was witnessed by Costanzo's 19-year-old son, Gianluca, and a friend. They reported that the fish, believed to be a great white shark, circled twice before attacking the diver and pulling him underneath the water.

Numerous ships and helicopters have been scouring the area over the past few days in search of the shark, but no sightings have been reported.

Sharks are common in the Mediterranean, but great white sharks are considered rare. The last verified fatal shark attack off Italy was nearly 30 years ago when an underwater photogapher was killed near Naples.