“Please avoid the area for your safety,” he wrote on X.City police said they received 911 emergency calls about a building collapse just after 8am Wednesday at the Mitchel Houses building.“Upon arrival, officers observed a partial building collapse,” police said in a statement.Incinerator shafts in New York City buildings were once used to dispose of trash, which was then burned on site. But they have largely been replaced with trash compactors, which can use the same chutes.