The U.S. Air Force has struck more than 60 targets at 16 sites of Yemen's Ansar Allah (Houthis) movement, the U.S. Air Force said.
The strikes targeted ammunition depots as well as missile launchers.
On Friday night, America and Britain carried out 23 airstrikes on targets in four provinces of Yemen.
Washington said the strikes in Yemen targeted missile depots, UAVs and radar stations. This will undermine and reduce the potential of the Houthis. In turn, the Yemeni Foreign Ministry, which is subordinate to the Ansar Allah movement, threatened the US and Britain with retribution for the attacks.
Many experts declare a possible escalation in the Middle East.