Washington DC - The US is sending a "small number" of additional troops to the Middle East in response to rising tensions in the region, the Pentagon said Monday, giving few further details.

The announcement comes as fears of a broader regional war grow, with Israel striking hundreds of targets in Lebanon in what is by far the deadliest cross-border escalation in nearly a year of violence between Israel and Hezbollah.

"In light of increased tension in the Middle East, and out of an abundance of caution, we are sending a small number of additional US military personnel forward to augment our forces that are already in the region," Pentagon spokesman Major General Pat Ryder told journalists, declining to provide further information for security reasons.

The US has thousands of troops in the Middle East region, as well as warships, fighter jets, and air defense systems deployed to protect both its forces and Israel.

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Ryder warned of the potential for the Israel-Hezbollah violence to escalate, calling for a diplomatic solution.

"Clearly there is the potential for these tit-for-tat operations between Israel and [Hezbollah] to escalate and to potentially spiral out of control into a wider regional war, which is why it's so important that we resolve... the situation through diplomacy," Ryder said.

World powers have implored Israel and Hezbollah to pull back from the brink of all-out war, with the focus of violence shifting sharply in recent days from Israel's southern front with Gaza to its northern border with Lebanon.

At least 274 people – including 21 children – have been killed in Israel's latest strikes on Lebanon.