Operation Northwoods

Operation Northwoods, or Northwoods, was a false-flag conspiracy plan, proposed within the United States government in 1962. The plan called for CIA or other operatives to commit apparent acts of terrorism in U.S. cities to create public support for a war against Castro-led Cuba. One plan was to "develop a Communist Cuban terror campaign in the Miami area, in other Florida cities and even in Washington".

Full text from wikipedia: http://en.wikipedia.org/wiki/Operation_Northwoods