Saudi Aramco attacks: What we know so far

* Yemen's Iran-aligned Houthi group, which is battling a Saudi-led coalition in Yemen, claimed responsibility for the attacks on Saturday on sites run by state-owned Saudi Aramco.* U.S. Secretary of State Mike Pompeo ruled out Yemeni involvement and accused Iran of leading the attacks.* U.S. President Donald Trump said the United States, which is embroiled in a row with Iran over its nuclear ambitions, was "locked and loaded" for a potential response.