British authorities found no link between a defused London car bomb and any international terrorist group during the early hours of their investigation, two officials in Washington said Friday. The officials, who were briefed on the investigation, said the inquiry in London's bustling nightclub district had yielded no suspects and no definitive description of anyone leaving the vehicle. London police defused the bomb after an ambulance crew spotted smoke coming from a Mercedes filled with a lethal mix of gasoline, propane and nails. The two officials in Washington, who spoke on condition of anonymity because they were not authorized to discuss the case, discounted reports that the bomb seemed similar to those used by insurgents in Iraq. They said it is too early in the investigation to assign any significance to those similarities.