Sviatoslav Tseholko, the press secretary of President Poroshenko, wrote on Facebook.
"Despite the truce, the Russian militants fired at Ukrainian electricians who were repairing power line in order to resume electricity supply of Avdiivka. Vice-Premier Hennadii Zubko informed the president. It was impossible to continue repair efforts due to the constant fire.
"The OSCE SMM and international partners of Ukraine were reported about the incident. Ukraine demands Russia to cease the fire immediately," Tseholko wrote.
The fighting in the vicinity of Avdiivka has been underway since late Saturday, Jan. 28.
After three days, Ukrainian soldiers managed to take enemy positions and improved their tactical set-up in the area. Unfortunately, casualties were reported among the military.
On Jan. 30, enemy strikes left the government-controlled town of Avdiivka without electricity, water and heat.
In the evening of Jan. 30, a state of emergency was declared in Avdiivka.
As reported by the anti-terrorist operation (ATO) Staff press center, the militants carry out non stop attacks on Ukrainian positions near the town.
A regional coordination center to aid local population has been set up.
According to the National Police, six civilians had been wounded and 26 houses damaged as of morning, Feb. 1. A female body of a civilian was found in Avdiivka downtown on Feb. 1.
The Donetsk regional civil-military administration said the sides had agreed to cease fire until 5 p.m. Wednesday.
Related materials: Avdiivka fighting