At least 76,000 people have been displaced in Yemen since July, with the number quadrupling in the past week as fighting flared between government forces and Iran-backed Houthi rebels, the United Nations said Saturday.

A recent escalation in fighting has alarmed international aid agencies and the U.N.

The Iran-backed Houthi militia has intensified its attacks in Yemen in recent days, firing five ballistic missiles toward areas in the south and west of