M-44 being set off.
https://www.youtube.com/watch?v=DlIg8N3uemA
The Fox news link tells a different story.
http://www.foxnews.com/us/2017/04/11/usda-halts-use-m-44-cyanide-bombs-in-idaho-following-death-family-pet.html
Fox news says the dog set off the device, the AP story says the boy set off the device.