I'm in Richmond, Virginia, and according to people monitoring the unencrypted fire department radios on twitter (one of them a fairly reputable community organizer, but rate the source as you will), this exact situation supposedly happened on Saturday night. Fire department got called to a shoe store fire, they faced some impediment reaching the fire, police showed up and dropped tear gas all over the area, and the fire department ended up back on the scanner requesting an ambulance for the commander on site for tear gas exposure, and additional PPE from another department to help the other fire fighters cope. The building ended up being marked a complete loss, although I'm unclear of the nitty gritty details like timelines, source of the fire, etc.
EDIT: I will also note that this, among other events, was used to justify calling for a curfew in town, and today, the mayor and police chief have condemned their own police officers for deploying tear gas on peaceful protests prior to the start of the curfews last night, and then putting forward a false justification (admitted by the police chief to have been a false justification, to be clear) for doing so.