LA MADDALENA, Sardinia (AP) _ Greenpeace activists sailed by a U.S. naval base on this Italian island Thursday to protest the alleged presence of radioactivity from nuclear-powered submarines.

The Greenpeace ship Sirius, flanked by several rubber boats, approached the American naval support vessel Orion and the protesters unfurled a large banner reading ''Nuclear Free La Maddalena.''

Port authorities sprayed jets of water at the protesters and escorted the Sirius away. No arrests were made.

Joining the protest were parliamentarians from Italy's Greens, Communist and far-left Proletarian Democracy parties.

An Italian Greenpeace spokesman, Paolo Guglielmi, said the environmentalist group carried out underwater tests last April near La Maddalena Navel Base that showed traces of radioactivity from submarines.

The Italian government has denied the base presents a radioactive hazard to residents.