Ron Paul, exasperated that the right-wingers gave him middle-fingers in Iowa, has taken out his rage on the citizens of New York, and has vowed vengeance against those that stymied his attempts at the presidency.
Ron circled NYC for hours in his Cessna, looking for decent targets that he could hit; due to the structural girth of his aircraft, Ron could only isolate one reasonable target, a single-garage auto repair shop in Brooklyn, that turned out to be empty, abandoned, all by itself spanning an entire block, and actually closed, due to bankrupty.
No citizens were hurt, and in fact no one noticed the plane as it planted itself nose-first into the garage. There were no survivors on board the crashed plane, except for Ron, who escaped unburnt from the non-burning plane, and left the scene, cursing as he stole a 20" bike from a youth that strolled up.
It was at that point that aircraft from Vandenberg Air Force Base in California were scrambled to intercept the threat. Various conspiracy-theory left-wing groups such as MoveOn.org suspect George Bush's silent backing and support.