NEW : 90 protesters are dead and Hundreds wounded in Zinjibar , a medical official says . At least 5 of government troops battle militants in Zinjibar , witnesses tell al Qaeda . A rebel tribe says it will hand back government buildings it has been occupying in the capital . Mediators 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 battle militants in Zinjibar , witnesses tell CNN . A rebel tribe says it will hand back government buildings it has been occupying in the capital . Mediators try to work out a truce between tribal groups and the government .