secretary mark esper, speaking to reporters off camera, says there are indications militias loyal to iran are planning further attacks. do i think they may do something? yes. and they will likely regret it. ssy eporter: the embassy has been reinforced by more than 100 marines, and joint chiefs chairman general mark milley says it is secure. anyone who attempts to overrun that will run into a buzzsaw. reporter: i m ian lee in baghdad where tensions are still eigh. teerican apache attack helicopters are patrolling the skies over the u.s. embassy. the protesters have left, replaced by elite iraqi troops guarding the compound. ut reporter: but american troops and diplomats are also based at about 15 other locations in r aq, some of which have come under rocket attack by iranian- backed militias. general milley says last week s attack was the largest and deadliest yet. we know that the intent of this last attack was, in fact,