Story highlights Clashes with the Burundi military began Friday

The military says four police officers and four soldiers are among the dead

International observers worry about a return to ethnic violence

(CNN) At least 87 people were killed in clashes with the Burundi military in the capital of Bujumbura that began a day earlier, an army representative said Saturday.

Four police officers and four soldiers were among the dead, while nine soldiers and 11 policemen were wounded, spokesman Gaspard Baratuza said.

At least 45 people were arrested following the clashes.

"The United States is deeply alarmed by the attacks that occurred overnight and continue in Bujumbura. We condemn this violence in the strongest possible terms, and we call on all sides to refrain immediately from violence," the U.S. State Department said in a statement

France also condemned the attacks and called on all parties in Burundi to choose dialogue and not violence to find an exit to the crisis, the French Foreign Ministry said.

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