A shaky truce took hold in Yemen on Monday under a U.N.-backed effort to end a war that has made the country a front in Saudi Arabia's region wide rivalry with Iran and caused one of the world's worst humanitarian crises.
The war-damaged capital Sanaa spent a quiet night, witnesses said, but residents said fighting flared in the southwestern city of Taiz soon after the planned start of the cessation of hostilities at 2100 GMT on Sunday.
