More than 8,000 civilians have been recorded killed in Ukraine since Russia invaded nearly a year ago, the U.N. human rights office said on Tuesday, describing the figure as only the “tip of the iceberg” with thousands more thought to have died.

The latest toll represents a significant upward revision from the previous tally, released earlier this month, of 7,199 recorded killed since the start of Moscow’s full-scale invasion on Feb. 24, 2022. Around 90% of the victims were killed by explosive weapons, it added.