0905 GMT [Dow Jones] BP (BP) shares are -7.1% at 302p, partly amid concerns that the development of a tropical storm may delay efforts to contain the Gulf of Mexico spill, says Peter Hutton of NCB Stockbrokers. "If tropical storm Alex were to cross into the Gulf of Mexico, BP will want to be cautious about sustaining damage to their infrastructure," Hutton says. Separately, another analyst says BP would take steps to protect its people and equipment if the tropical storm develops. "That means the relief wells may need to be shut down," the analyst says. NCB has a hold rating and 420p target.(alex.macdonald@dowjones.com) Contact us in London. +44-20-7842-9464 Markettalk.eu@dowjones.com (END) Dow Jones Newswires June 25, 2010 05:05 ET (09:05 GMT)