Besieged city of mariupol. ukrainian forces still have control of the small area but they are surrounded by russians. now an alleged recording of a russian commander saying they are planning to, quote, level everything to the ground around the steel factory, a complex of four square miles. while cnn cannot authentic indicate the recording, it is not the first time they ve released recordings of russian soldiers talking about killing and raping civilians. and as matt rivers reports, the evacuation quarter is growing more desperate by the hour. reporter: the city of mariupol has been bruised and battered by relentless attacks. local officials say some 22,000 people have already been killed there in an estimated 100,000 civilians are desperately waiting to be evacuated from the port city. ukrainian troops are defending one small corner of the city still under their control. the area around the azov steel plan, where an estimated 1,000 civilians are sheltering.