The US has released footage showing President Joe Biden's latest airstrikes against Iranian proxy forces in Syria, in an escalating tit-for-tat that follows a wave of drone and missile attacks on US forces in the region.

The strikes, carried out by Air Force F-15E fighter jets on Sunday, targeted an Iranian Revolutionary Guard training facility in North Abu Kamal, and a militia safe house in Mayadin, the Pentagon said.

A senior US defense official told DailyMail.com that as of Monday, US and coalition troops have been attacked at least 55 times in Iraq and Syria since October 17, injuring 59 Americans, though all have returned to duty. 

The Iran-backed militant groups claiming responsibility for the missile and kamikaze drone attacks have said they are in response to US support for Israel in its war against Hamas in Gaza. 

The escalating violence in Syria and Iraq is raising concerns that the Israel-Hamas conflict could widen into a regional conflict, with US troops at bases throughout Middle East becoming targets. 

The US still has about 900 troops in Syria, and 2,500 more in neighboring Iraq, to advise and assist local forces trying to prevent a resurgence of Islamic State, which was defeated after seizing large swathes of both countries. 

In recent weeks, US forces in Iraq and Syria have come under nearly daily bombardment from Iran-backed militants, who operate under the umbrella brand of the Islamic Resistance in Iraq.