Armenian police say eight people were killed and 33 officers injured in clashes between police and protesters angry over alleged election fraud.

Police spokesman Sayat Shirinian announced the deaths in a statement Sunday. He did not say whether the eight killed were protesters or police, or give other details.

The president declared a 20-day state of emergency late Saturday night following a day of violence between police and some 15,000 demonstrators.

Troops and armored vehicles patrolled the main streets of Armenia's capital Sunday. The opposition leader also has appealed for calm.