I can’t find much on the web about this because it’s developing, here’s the Fox News report:

WASHINGTON — Several people have been taken to a hospital in the nation’s capital after a man was found dead in an apparent suicide with a vial of a hazardous substance next to him.

D.C. fire department spokesman Alan Etter says authorities went to the home Monday afternoon and found the man and the vial.

Fire officials say police left the home and summoned a hazardous-materials crew. Eleven fire workers, one police officer and one neighbor were taken to hospitals as a precaution.

Etter says the fire department will not identify the substance because police are investigating.

USA Today is running the same AP report.