KIEV, Ukraine (AP) — East Ukraine has suffered the worst violence in more than a week. Overnight fighting between pro-Russian rebels and government troops in the region has killed at least 12 people and wounded 32.

Military officials say at least nine servicemen have been killed in the last day and 27 have been wounded.

And officials with the city council of Donetsk say at least three civilians have been killed and five wounded in overnight shelling of a residential area in the north, where fighting has centered on the government-held airport.

Violence has continued despite a cease-fire declared on Sept. 5. Ukrainian President Petro Poroshenko has been at pains to prove to a skeptical audience at home that his peace plan is working.

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