Ethiopian hospital sources say around two dozen people have been killed and 150 wounded in a second straight day of clashes between police and demonstrators in the capital, Addis Ababa.
Security forces fired shots Wednesday to disperse stone-throwing opposition supporters protesting disputed elections held in May. The government says only 11 people were killed.
Violence Tuesday left eight people dead.
Ethiopian authorities have also arrested scores of protesters and several opposition leaders, including the head of the main opposition party (the Coalition for Democracy and Unity).
The U.S. State Department deplored the violence by government security forces as well as what it said were cynical attempts by opposition activists to provoke violent incidents.
The opposition has called for protests against the ruling party of Prime Minister Meles Zenawi, charging massive fraud in the May polls.
Some information for this story provided by AFP and AP.