Three U.S. defense officials confirmed late Tuesday night that 4,000 troops from the U.S. Army’s 82nd Airborne Division’s alert brigade are preparing to mobilize to the Middle East after protesters encircled the U.S. Embassy in Baghdad earlier in the day.

Iran-backed protesters chanted, “Death to America,” and set fires to the building in Baghdad after U.S. airstrikes left 25 dead last week. President Trump dispatched 100 Marines from neighboring Kuwait to protect the embassy.