The US has sent a guided missile submarine to the Middle East, as tensions grow in the region.
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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.
It signals the US's determination to help defend Israel from any attack by Iran - with Mr Austin saying US would "take every possible step" to defend its ally.
source: bbc