April 20 (UPI) -- Iran said that it carried out drone strikes on Monday against U.S. military vessels blockading its ports after the U.S. Navy attacked an Iranian-flagged container ship in the Gulf of Oman. The state-run Tasnim News Agency said the Iranian military "launched drone strikes toward several U.S. military vessels in the area" in retaliation for the boarding and seizure of the Touska on Sunday night while it was en route to Iran from China. "We caution that the Armed Forces of the