The United States and Britain launched strikes against 36 Houthi targets in Yemen on late Saturday, in the second day of major US operations against Iran-linked groups following a deadly attack on American troops last weekend.

The strikes hit buried weapons storage facilities, missile systems, launchers and other capabilities the Houthis have used to attack Red Sea shipping, the Pentagon said, adding it targeted 13 locations across the country.

It was the latest sign of spreading conflict in the Middle East since war erupted between Israel and Hamas after the militant Palestinian group's deadly assault on Israel on Oct.7.

"This collective action sends a clear message to the Houthis that they will continue to bear further consequences if they do not end their illegal attacks on international shipping and naval vessels," U.S. Defense Secretary Lloyd Austin said.

Houthi military spokesperson Yahya Sarea said the U.S. strikes "will not pass without a response and consequences."

The Yemen strikes are running parallel to an unfolding U.S. campaign of military retaliation over the killing of three American soldiers in a drone strike by Iran-backed militants on an outpost in Jordan.

On Friday, the U.S. carried out the first wave of that retaliation, striking in Iraq and Syria against more than 85 targets linked to Iran's Islamic Revolutionary Guard Corps (IRGC) and militias it backs, reportedly killing nearly 40 people.