NEW : The bombers used explosives-laden vehicles to hit posts on the outskirts of Zinjibar and in the town of Dofas , the officials said . Yemeni official : At least 60 people are killed in the fighting . Fierce clashes erupt as the government fights back . They are close to taking over a strategically important town , officials fear . Ansar al - Islam militants control important roads , officials say .
NEW : Yemeni official : At least 60 people are killed in the fighting . Fierce clashes erupt as the government fights back . They are close to taking over a strategically important town , officials fear . Ansar al - Islam militants control important roads , officials say .