Evidence of mass graves growing in Mariupol, theater death toll at 300

The United Nations monitoring mission in Ukraine says there is more evidence of mass graves in the besieged port city of Mariupol. 

Total civilian casualties are hard to verify given the city has been under Russian bombardments for weeks.

But 300 people are now thought to have died in the theater attack alone.

U.S. correspondent Caroline Malone reports.

IN: Mass graves

OUT: Caroline Malone, Washington

DUR: 0:52

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