The U.N. human rights office says its strict methodology in counting casualties in Ukraine's conflict has yielded very few confirmed casualties in Mariupol, largely because of difficulties getting access in and information out of the besieged port city.<br />''Matilda Bogner, who heads the rights office's Ukraine branch, noted that council leaders in Mariupol have estimated more than 2,000 civilian deaths in the city following Russia's military operation on Feb. 24.<br />''<br />''Overall, the rights office has counted at least 1,035 civilians killed in Ukraine and 1,650 injured but Bogner said it doesn't have a full picture of locations that have seen intense fighting, in particular Mariupol and Volnovakha. The office has acknowledged that its tally is likely to underestimate the actual toll.<br />