Britain Police investigating the London bomb blasts were probing extremist groups linked to Al-Qaeda as recovery teams tried to pull yet more bodies from a wrecked subway train, fearing the final death toll could climb well above the current 50. Britain Al-Qaeda claimed responsibility for this week's deadly bombings in London in an Internet statement posted in the name of the Europe Division of the network's Abu Hafs al-Masri Brigades. Britain The world must deal with the underlying causes of terrorism, British Prime Minister Tony Blair said, insisting that security alone could not protect the country from attacks. Britain Two days after enduring Britain's worst-ever terrorist attack, London was marking the 60th anniversary of the end of World War II, when it showed similar resilience under a far greater threat. Sudan Sudanese President Omar al-Beshir signed a new power-sharing constitution intended to put a final seal on two decades of civil war. US A weaker Hurricane Dennis moved over the Gulf of Mexico pulling away from Cuba, where it killed 10 people and left 1.5 million homeless, after causing five deaths in Haiti. Philippines The Philippine opposition kept up pressure to oust President Gloria Arroyo following the mass resignation of key cabinet allies as the military issued renewed warnings to troops to remain neutral. Iraq Iraq rebels fired mortars at Baghdad's main oil refinery late Friday in a renewed assault on key infrastructure as a US commander suggested such attacks marked a new twist in insurgent tactics. Brazil Brazil's Ministry of Health announced Friday that Abbott Laboratories had agreed to lower the price of its HIV/AIDS drug Kaletra to prevent Brazil from breaking the company's patent, as it had threatened.