A flare-up of fighting in Yemen's energy-rich Marib province is testing 10 months of relative calm, the longest stretch in an eight-year civil war, under a U.N.-brokered truce deal that lapsed in October but had largely held.
Forces of the Iran-aligned Houthi movement, de facto authorities in northern Yemen, launched an attack late on Tuesday into Marib's Harib district, government and military sources and a resident told Reuters.
The three sources said there was an unknown number of casualties in the clashes.
