A storm of the location of a Ukrainian National Guard regiment in Luhansk by unlawful armed groups lasted for more than ten hours, and three Ukrainian servicemen were injured, the National Guard press service said.

"The law enforcers returned fire until their ammunition ran out. Three law enforcement officers were wounded. The attackers had about 20 men wounded and six dead. The gunfire destroyed the motor pool and the unit's headquarters and damaged a barrack," the report runs.

"Servicemen of the military unit are being moved to a safe place," the National Guard said.

Over 300 unknown armed men surrounded the location of a patrol police regiment of the Ukrainian National Guard stationed in Luhansk early in the morning hours on Wednesday and opened fire on the law enforcers.

They were firing heavy weapons, such as submachine guns, machine guns, mortars and grenade launchers. There were snipers there, too.