NEW : At least 5 protesters are dead and 90 wounded in Taiz , a medical official says . Hundreds of government troops fight rebels in Zinjibar , witnesses tell CNN . A rebel tribe says it will hand back government buildings it has been occupying in the city . The militants `` suddenly arrived and in large numbers . They try to work out a truce between tribal groups and the government .
NEW : At least 5 protesters are dead and 90 wounded in Taiz , a medical official says . Hundreds of government troops fight rebels in Zinjibar , witnesses tell CNN . A rebel tribe says it will hand back government buildings it has been occupying in the city . They try to work out a truce between tribal groups and the government .