U.S. Secretary of State John Kerry is urging all parties in Burundi to stop violence and instead begin dialogue to end what has been months of unrest in the country.
Kerry wrote on Twitter Sunday that the killing must end, including "disproportionate response by security services."
Earlier in the day, the State Department told U.S. citizens to avoid traveling to Burundi, and recommended that those already in the country leave as soon as possible as political violence persists.
More than 80 people were killed Friday when armed attackers raided army facilities in the capital, Bujumbura. Among the dead were eight security officers and scores of assailants, according to an army spokesman.
The unrest began in April when the president announced he would seek a third term. Critics said he was violating the constitution's two-term limit as well as an agreement that ended Burundi's 12-year civil war.