C AIRO — Iran on Sunday once again denied aiding Yemen's Houthi rebels after the United States launched a wave of airstrikes against them and President Donald Trump warned that Tehran would be held “fully accountable” for their actions.

Under former President Joe Biden, the U.S. and the United Kingdom began a series of airstrikes against the Houthis starting in January 2024. A December report by The International Institute for Strategic Studies said the U.S. and its partners struck the Houthis over 260 times up to that point.

The Iranian-backed rebels, who have targeted Israel and shipping in the Red Sea, said children were among those killed in the strikes ordered by President Trump.

Houthi leader Abdul Malik al-Houthi said his militants would continue to target American ships in the Red Sea as long as the U.S. attacks Yemen, warning, 'If they continue their aggression, we will continue the escalation.