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Hani Mohammed, Associated Press
Shiite fighters, known as Houthis, ride on a patrol truck as they chant slogans during a tribal gathering showing support for the Houthi movement in Sanaa, Yemen, Monday, Dec. 14, 2015.

SANAA, Yemen — Yemeni security officials say heavy fighting is underway between the country's internationally recognized government and Shiite rebels, hours ahead of the start of an agreed-on, weeklong truce.

The officials say there are clashes in Yemen's southern, central and western provinces despite the agreement by the warring factions to lay down their weapons at five minutes to midnight Monday — the eve of planned peace talks in Geneva.

The officials are neutral in Yemen's civil war. They spoke on condition of anonymity because they are not authorized to talk to reporters.

Yemen's fighting pits the internationally recognized government, backed by a Saudi-led coalition, against the rebels known as Houthis and troops loyal to former President Ali Abdullah Saleh.

Previous truces and U.N.-brokered talks to resolve the conflict have ended in failure.