Low flying single engine plane flies directly over President Bush's motorcade in Philadelphia, before being intercepted and grounded by police... MORE... Security breach occurred at 12:07PM ET on Interstate 95 heading south toward Philadelphia, DRUDGE has learned. Bush had just finished a visit to the Financial Management Service Facility, which mails out tax rebate checks. Flying from right to left the white plane flew over the Presidents motorcade just north of exit 26, with a police chopper hot on its tail. Breach occurred just weeks after stow away boarded Bush press plane in Africa... Developing...