KYIV, Ukraine (AP) — Pro-Kremlin officials are blaming Ukraine for a rocket attack that struck the mayor’s office in a key Ukrainian city controlled by the separatists. The municipal building in Donetsk was seriously damaged by the rocket attack. Separately, Ukrainian officials said Russian rockets struck a city across from the Zaporizhzhia nuclear power plant. Kyiv also reported holding the line in fierce fighting around the town of Bakhmut. The fighting comes seven weeks into a Ukrainian counteroffensive in the south and east. Late Saturday, a Washington-based think tank accused Moscow of forcibly deporting Ukrainians to Russia and said it likely amounted to ethnic cleansing.