Ten people were killed in clashes between Houthi rebels and government-allied tribesmen in north Yemen, rebel and tribal sources said on Tuesday, in violence that could undermine the region's uneasy four-month truce. Yemen's government agreed a February truce with the Houthi rebels, named after their leaders' clan, to halt a war that has raged on and off since 2004 and displaced 250,000 people. The ceasefire has largely held, but spikes of violence evoke fears of growing instability in a country that neighbors Saudi Arabia, which was briefly drawn into the war last year when rebels seized Saudi border areas. Tribal sources from the northern village of Bani Awair said that Houthi rebels entered the village by force and tried to take over a school. The rebels clashed with pro-government villagers, killing one villager and wounding six, they said. Four villagers were killed and three wounded in another clash with the rebels in the northern province of Amran, the Interior Ministry said on its website. There was no immediate rebel comment. UNICEF's Yemen representative in May condemned school seizures by both rebels and pro-government tribal forces.