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 . Hundreds of protesters responded by throwing rocks at the security forces , which drew more gunfire from the troops , witnesses said . 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 : 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 .