Agence France-Presse: US officials have demanded that BP set up a special fund to pay oil spill claims and said President Barack Obama will give a rare White House address next week, in a sign of the seriousness of the disaster both for the country and his presidency. As Obama prepared to tour stricken states on his fourth visit to the Gulf of Mexico since the disaster, top aides ordered BP to set up an escrow account to pay legitimate claims and let an independent panel oversee the process. The …