Israel said it bombed Houthi targets in Yemen on Sunday and mounted further airstrikes in Lebanon, expanding its confrontation with Iran's allies in the region two days after killing the Hezbollah leader Sayyed Hassan Nasrallah.

The airstrikes on Yemen's port of Hodeidah were a response to Houthi missile attacks on Israel in recent days, Israel said, amid fears that Middle East fighting could spin out of control and draw in Iran and the United States, Israel's main ally.

The Houthi-run health ministry said at least four people were killed and 29 wounded.