SLOVIANSK, May 28. /ITAR-TASS/. A school building has been heavily damaged as a result of artillery shelling in Sloviansk, Donetsk region. The Ukrainian law enforcers fired from artillery guns in the area of the settlement of Artyom, a representative of the people's self defenses forces told ITAR-TASS.

An artillery shell has destroyed the roof of the school building, preliminary reports said.

Earlier reports said fighter planes had again appeared over the city. Ukraine’s law-enforcers blocked all exits from Donetsk and did not even let passenger buses leave the area of military operation.

Meanwhile, the city scrambled to evacuate schools and all the housing and public utilities departments were ordered to prepare bomb shelters in case of active fighting and bombings.

Denis Pushilin, the chairman of the self-proclaimed Donetsk People’s Republic (DPR) Supreme Council presidium, told ITAR-TASS that more than 50 militiamen and 20-50 civilians have died since Ukrainian law enforcers launched the active phase of their military operation in Donetsk on Monday, May 26.