Man calls 911 for medical help and takes firefighters hostage.

He had guns and took hostages.  (It is a good thing he did not have knives or a spoon.  This could have been dangerous.)  The hostage taker was killed and the others had to deal with a concussion genade.

http://www.usatoday.com/story/news/nation/2013/04/10/firefighters-held-hostage-georgia/2071969/