down interstate 2059. the truck was carrying hydrogen peroxide and sulfuric acid. fire officials say one of the cylinders ruptured and ignited another chemical on the truck. nearby residents were evacuated. the fire is under control. crews are conducting a hazmat cleanup. protesters took to the streets of chicago wednesday to demand mayor rahm emanuel s resignation. it s the latest fallout from the police video from last year that shows an officer shooting a teenager 16 times. nbc s dan schenemen has the latest. reporter: an emotional meeting of the chicago police force. they brought a bunch of liars, a bunch of thieves, and destroyed a community that i put my life in. [ chanting ] reporter: the meeting came just hours after angry demonstrators shut down streets, in one of the country s most famous shopping areas. calling on mayor rahm emanuel to step down.