Yemen's Houthis said on Tuesday they would expand their range of targets in Israel in the next hours and days unless the "aggression" on Gaza stops. The Iran-aligned group's military spokesperson Yahya Sarea also confirmed that they had targeted an air base in Israel with a ballistic missile.

The United States and Iran-backed Houthi rebels in Yemen are both vowing escalation after the U.S. launched airstrikes to deter the rebels from attacking military and commercial vessels on one of the world's busiest shipping corridors.

The U.S. carried out new airstrikes on Yemen, expanding the biggest U.S. military operation in the Middle East since President Trump took office.

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.