Mariupol has been the target of sustained attacks by Russian forces because of its strategic position along Ukraine's southern border.
For weeks now, the city has been shelled near-indiscriminately. One Human Rights Watch report released on Monday described the city as a "freezing hellscape riddled with dead bodies and destroyed buildings".
Ukrainian leader Volodymyr Zelensky has said about a quarter of the population - or 100,000 people - are still trapped in "inhumane conditions".
He described the horror endured by residents in his midnight address: "No food. No water. No medicine. Under constant shelling, under constant bombing."
These new satellite images from firm Maxar Technologies show the scale of the damage in the past day.
Zelensky also said Ukraine officials and allies were doing their best to get aid into the city and more civilians out, he said. On Tuesday, about 7,000 people managed to escape the city.
But those fleeing have also been attacked along the negotiated humanitarian corridors, he said.
On Tuesday one humanitarian convoy was captured by Russian troops, he claimed.
He said state emergency workers and bus drivers were taken prisoner.
"We are doing everything we can to free our people and unblock the movement of humanitarian aid," he said.
BBC