Interior Minister Arsen Avakov said in a Facebook post that a Security Service officer was killed in Slovyansk, where the police station and the Security Service office were seized a day earlier by camouflaged armed men. He also reported a number of casualties among the militia, but did not offer a number.
An Associated Press reporter found a bullet-ridden SUV on the side of the road and a pool of blood on the passenger seat where the gunbattle was supposed to have taken place.
Vladimir Kolodchenko, a lawmaker from the area who witnessed the attack, said a car with four gunmen pulled up on the road in a wooden area outside Slovyansk and open fire on Ukrainian soldiers who were standing beside their vehicles. Both attackers and the Ukrainian servicemen left soon after the shooting.
Unrest has spread to several municipalities in eastern Ukraine, including the major industrial city of Donetsk, which has a large Russian-speaking population.
Donetsk was also the support base for Viktor Yanukovych, the Ukrainian president ousted in February following months of protests in Kiev, the capital, that were ignited by his decision to back away from closer relations with the European Union and turn toward Russia. Ethnic Russians in Ukraine's east widely fear that the new pro-Western Ukrainian government will suppress them.
The regional administration in Donetsk issued a statement, confirming one dead and saying nine were wounded. It did not identify them, but said one person was shot outside Slovyansk.
Avakov has described the unrest as "Russian aggression."
In an earlier post, he said the separatists who had seized the buildings in Slovyan