Speaking to the UN's Human Rights Council on Wednesday, Michelle Bachelet decried a life of ``sheer terror'' for people in the southeastern port city since Russia's invasion on Feb. 24.

Ukraine has charged that Russian forces were forcibly taking people from Mariupol and other areas to Russia. Moscow has denied the claims, saying about 500,000 Ukrainians left for Russia voluntarily.

Bachelet said her office also is reviewing ``credible allegations'' that Russian forces have used cluster munitions 24 times and allegations that Ukrainian forces also have done so.

She says the office also received allegations that two civilians affiliated with Russian armed forces, or backing pro-Russian views, had been killed. She criticized the ``widespread'' detention of civilians who openly support Ukraine in areas under Russian control.