Sergei Orlov, deputy mayor of Mariupol, said Russian forces are "destroying" the besieged Ukrainian city and that patients in a hospital were used as captives.
"There are a lot of fights on our streets, and the situation yesterday was terrible," he told CNN's Bianna Golodryga.
"They're destroying the city. For example, yesterday, we counted 22 aircraft which were bombing our city, and at least 100 bombs they used to bomb our city. The damage is awful," he said.
Orlov said a hospital in the city was overtaken by Russian troops, who used doctors and patients as captives, which he labeled a "war crime."
"The biggest hospital in the 17th district of our cities is captured by Russian troops and the Russian army used doctors and patients as hostages in this building. We do not have any access to them," he said.
A Ukrainian official has also accused Russian troops of holding people captive at the hospital on Tuesday. Pavlo Kyrylenko, the head of Donetsk regional administration, said doctors and patients were being held against their will in the Mariupol regional intensive care hospital, also referred to as Hospital No. 2.
While 2,000 cars were able to get out of Mariupol on Tuesday, according to the city council, Orlov said between 350,000-400,000 people are still in the city.
A large convoy of humanitarian aid that was supposed to arrive on Sunday had still not reached the city as of Tuesday morning, according to officials.
There are shortages of water and food in the city, Orlov said.
View drone video of the destruction in Mariupol here: