An oxygen canister is seen on Pierluigi de Felice, trimmer of America's Cup challenger team Luna Rossa Challenge, during a news conference at the team's base in Alameda, California May 17, 2013. Clouds hung over the America's Cup sailing regatta on Friday after investigators asked the teams to temporarily halt practicing on blustery San Francisco bay following a deadly accident last week. REUTERS/Stephen Lam (UNITED STATES - Tags: SPORT YACHTING)