Someone or something lit 2 plastic garbage cans on fire

In front of the Sellwood Building, that’s located at 202 West Superior Street, Duluth, MN 55802, I found two plastic trash cans that had been set on fire.  This image was taken looking east.

This image was taken looking west.  I’ve read about a dangerous, new teen trend of burning plastic trash cans, and then inhaling the fumes.