The US has sent a guided missile submarine to the Middle East, as tensions grow over Israel-Gaza war.
US Defence Secretary Lloyd Austin also said an aircraft carrier which was already heading to the area would sail there more quickly.
The move comes in response to fears of a wider regional conflict, after the recent assassination of senior Hezbollah and Hamas leaders.
Iran has blamed Israel for the assassination of Hamas’s political leader Ismail Haniyeh on their soil, and have vowed to punish it.
Israel has not commented but is widely believed to have been behind it.
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