United Nations' chief human rights official says millions of Venezuelans continue to suffer rights violations, including possible extrajudicial killings carried out by a special police force.

Michelle Bachelet gave an oral report on Venezuela to the U.N. Human Rights Council in Geneva on Monday. It follows a scathing written report issued in July that drew a government backlash.

Bachelet says non-governmental organizations report that the Special Action police force carried out 57 suspected extrajudicial killings in July alone within Caracas.

She had called for officials to dismantle the unit.

Bachelet also says groups collaborating with her in the earlier report have come under criticism and threats by senior officials.

President Nicolas Maduro's government didn't immediately respond to Bachelet's latest comments, but rejected earlier criticism as biased and demanded corrections.