Mariupol mayor says siege has killed 

more than 10K civilians

 
...the death toll could surpass 20,000, with corpses that were “carpeted through the streets.”

Speaking by phone Monday to The Associated Press, Mayor Vadym Boychenko also said Russian 
forces brought mobile cremation equipment to the city to dispose of the bodies...

...
“Mobile crematoriums have arrived in the form of trucks: You open it, and there is a pipe inside and these bodies are burned,”
...

...he accused Russian forces of refusing to allow humanitarian convoys into the city in an attempt to conceal the carnage.

Russian forces have taken many bodies to a huge shopping center where there are storage facilities and refrigerators, Boychenko said.

...

Only those residents who have passed the Russian “filtration camps” are released from the city, Boychenko said. He said improvised prisons were organized for those who did not pass the “filtering,” while at least 33,000 were taken to Russia or to separatist territory in Ukraine.