Some said that the occupiers came from Russia; the Cossacks themselves said that only a few people among them had come from Russia. On 7 May, insurgents also seized the prosecutor's office in Sievierodonetsk. Luhansk People's Republic supporters stormed government buildings in Starobilsk on 8 May, replacing the Ukrainian flag with that of the Republic. Sources within the Ukrainian Ministry of Internal Affairs said that as of 10 May 2014, the day before the proposed status referendum, Ukrainian forces still retained control over 50% of Luhansk Oblast.