Story highlights U.S. Secretary of State John Kerry calls on Russia to end separatist support OSCE monitors say rockets were likely fired from pro-Russian rebel territory Fighting between rebels and government forces has intensified in recent days
Another 102 people were injured, at least 75 of whom needed hospital treatment, and many suffered shrapnel injuries, Mariupol City Council said.
Pro-Russian separatists are blamed for the attack on residential areas in the port city, Donetsk regional police chief Vyacheslav Abroskin said on his Facebook page.
The Interior Ministry said one person was arrested in connection with the attack.
Based on preliminary assessments, the shells were fired from Grad rocket systems, a statement from Mariupol City Council said.
The statement also said the situation was under control, and urged residents not to panic but to rely on information from official sources only.
Monitors with the Organization for Security and Co-operation in Europe said they conducted a crater analysis which showed the use of Grad and Uragan rockets that likely originated from areas controlled by the pro-Russian rebel group Donetsk People's Republic (DPR).
The shelling comes amid a surge in fighting between government forces and pro-Russian separatists.
U.S. Secretary of State John Kerry warned of increased international pressure on Russia.
"We call on Russia to end its support for separatists immediately, close the international border with Ukraine, and withdraw all weapons, fighters and financial backing," Kerry said in a statement.
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At least 30 killed in shelling in Ukrainian city of ...