DONETSK, Ukraine (AP) — A rebel-held city in eastern Ukraine came under intensified shelling Wednesday as the U.N. revealed that the death toll from the fighting between government troops and separatists has nearly doubled in the last two weeks.

A spokeswoman for the U.N.’s human rights office, Cecile Pouilly, said the organization’s “very conservative estimates” show the overall death toll has risen to at least 2,086 people as of Aug. 10, up from 1,129 on July 26.