NBC - Federal authorities say a construction crew discovered a stockpile of stolen military explosives buried in central Arizona.
The crew discovered the cache in October while clearing land about a hundred miles northwest of Phoenix.
Officials say there were 80 blocks of C4 plastic explosive, 9 Claymore antipersonnel mines, and a roll of military detonating cord buried about five-feet underground, inside large plastic pipes.
Now the Bureau of Alcohol, Tobacco, Firearms and Explosives is offering a $10,000 reward for information leading to the arrest and conviction of anyone responsible for the theft.
Authorities believe the explosives have been buried for about 20 years.