High winds and stormy seas prevented French surveillance craft approaching the sunken Italian tanker Ievoli Sun to probe for pollution from its toxic cargo. A sonar-equipped minesweeper due to examine the wreck and an observation plane and helicopter meant to track pollution slicks from Tuesday's Channel shipwreck stayed in port at Cherbourg while smaller boats tried to survey the area. Maritime authorities were due to announce later the first results of tests on water samples taken on Wednesday. "Given these weather conditions, the minesweeper Le Cephee, which returned to Cherbourg last night, could not leave port this morning," Lieutenant Bertrand Bonneau, spokesman for the port's maritime authority, said. "The plane and helicopter couldn't take off either," he added.