Security officials and tribesmen in Yemen say clashes between Shiite rebels and Islamist tribesmen backed by national army units have killed and wounded dozens in a northern city.

Officials say the fighting intensified over the past 48 hours near the main prison of Amran, where military jets bombed Shiite Hawthi rebels trying to take control of the city. Officials could not give specific casualty figures for the fighting.

The officials spoke on condition of anonymity because they were not authorized to brief journalists. […]