At least six people were killed and 15 injured during shelling of the eastern Ukrainian city of Sloviansk on Sunday, according to Tetiana Tiurina, the head of the Public Information and Communication Department of Donetsk region.
In a video message posted to Facebook on Sunday, Sloviansk Mayor Vadym Liakh said "many" people had been killed and wounded due to shelling in the city.
The mayor said the city was experiencing its heaviest shelling in recent days and up to 15 fires are blazing around Sloviansk.
The nearby city of Kramatorsk was also hit with three missile strikes on Sunday morning but there were no casualties, according to Ukraine's Donetsk regional military administration.
A residential complex and part of a road in a residential area were damaged, the regional military administration said.
"For the second day, the occupiers are hitting Kramatorsk with SMERCH anti-aircraft missiles. They destroy civilian infrastructure and target the civilian population," Kramatorsk Mayor Oleksandr Honcharenko claimed while posting photos of the damage.
CNN has been unable to independently verify those claims.