Reports say more than 80 people were wounded. Graphic video footage showed bodies lying strewn on the street.
Authorities say at least 27 people have been killed in attacks on several locations in Ukraine’s government-held city of Mariupol.
Local officials blamed pro-Russian separatists for the barrage, one of which struck at a crowded open air market. But rebels denied targeting the city.
Reports say more than 80 people were wounded. Graphic video footage showed bodies lying strewn on the streets amid a scene of carnage.
Pro-Russian separatists have captured large areas of two eastern regions of Ukraine causing a million people to flee their homes.
During the past two weeks, there’s been seen a surge in fighting between government forces and rebels.
Over 250 people have been killed, bringing the overall death-toll in the conflict to more than 5,000 since last April.
Despite international calls for a new ceasefire, rebels vowed just a day ago that they would continue their offensive.