The decision to send an aircraft carrier and a group of Air Force bombers to the Middle East was based in part on intelligence indications that Iran had moved short-range ballistic missiles by boat in waters off its shores, an American official said Tuesday.

The movement, first reported by CNN, was among a range of recent indications that Iran might be considering or preparing to attack U.S. forces in the region, said the official, who spoke on condition of anonymity in order to discuss sensitive intelligence.

Read more at Associated Press News.