Opposition parties called for military action against the central government . Heavily armed tribesmen loyal to the anti - government Ahmar tribe have been attacking Sanaa . He has vowed to return to Yemen to finish his term as president . More than 200 pro - government heavily armed troops are stationed in the outskirts of town .
Opposition parties called for military action against the central government . Heavily armed tribesmen loyal to the anti - government Ahmar tribe have been attacking Sanaa . More than 200 pro - government heavily armed troops are stationed in the outskirts of town .