Explosions thundered in Poltava, Elizavetagrad and Krupivnitsky, the Ukrainian media reported. Earlier, explosions were reported in Odessa. The bomb alarm is heard in the regions of Kyiv, Dnepropetrovsk, Kirovohrad, Mykolaiv, Odessa, Poltava, Sumy, Kharkiv, Cherkasy and Chernihiv.