Yemen's Houthi rebels, who were threatened with an air and naval blockade by Israel on Tuesday, are one of Iran's few allies still standing since the Gaza war spilled across the Middle East. WHAT IS THE HISTORY OF THE HOUTHIS?

The Israeli military said on Tuesday it had intercepted a missile fired from Yemen, hours after attacking Houthi militia facilities at Yemen's port of Hodeidah. Alarm sirens sounded in Jerusalem, the occupied West Bank and several areas in central Israel.

The Israeli army and Houthi-controlled media reported the strikes on Hodeidah, a key port for humanitarian aid imports, on Tuesday. An Israeli official said an “aerial and naval blockade” could follow unless Houthi rebels halt attacks on Israel.