A meteor crashing toward Earth exploded over the northeastern United States on Saturday, NASA said , setting off booms that echoed over the region with a blast equivalent to 300 tons of TNT. The fireball broke up over northeastern Massachusetts and southeastern New Hampshire at 2:06 pm (18:06 GMT), the US space agency's deputy news chief Jennifer Dooren told AFP in a statement. "This fireball was not associated with any currently active meteor shower , but it was a natural object and not a re-