U.S. says Iranian gunboats harassed warships

WASHINGTON - Iranian Revolutionary Guard gunboats harassed three U.S. Navy warships in the Strait of Hormuz Sunday, in what the U.S. military considers a "significant provocative act." Military officials told NBC News that two U.S. Navy destroyers and one frigate were heading into the Persian Gulf through the international waters of the Strait of Hormuz when five armed "fast boats" of the Iranian Revolutionary Guard approached a high speed, darting in and out of the formation.