Yemen's Huthi rebels on Sunday promised a "huge" retaliation against Israel for a deadly strike on the port of Hodeida, as regional fallout widens from months of war in Gaza.
The Israeli strike, the first claimed by Israel in Yemen, set oil tanks ablaze at the vital port and came a day after the first fatal attack by the Huthis in Israel.
On Sunday, Israel said it intercepted a missile fired from Yemen and struck targets in southern Lebanon. Residents of southern Gaza reported combat in the Rafah area.
The fighting across the region came ahead of Prime Minister Benjamin Netanyahu's trip this week to Washington, which has been trying to secure a ceasefire in the more than nine-month war between Israel and Palestinian militants Hamas in Gaza.