On Tuesday, rebel Houthi forces from Yemen claimed responsibility for launching an armed drone attack against a Saudi oil facility near the Saudi capital Riyadh. Some experts have said this was not the first such attack by Houthis against Saudi targets, and no evidence has been revealed to tie Iran—which backs the Houthis—to the attack. The attack came two days after four oil tankers, including two Saudi tankers, were damaged off the coast of the United Arab Emirates in what Saudi Arabia described as a sabotage attack.