Pine, Arizona — A construction crew was working in the small northern Arizona town, when they discovered large plastic pipes buried underground. After further digging, they realized the pipes were packed full of military-type explosives. They called authorities, and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) ended up confiscating 80 blocks of M112 C4 (built for military use), nine M18A1 Claymores, and a roll of detonating cord, otherwise known as detcord. Upon further investigation, the ATF concluded that the explosives had potentially been there for approximately 20 years.

Authorities are offering a reward of $10,000 for any information that leads to the arrest and conviction of the owner of these explosives.

These are not military imitation explosives, they are specifically developed and produced for the military. They do not appear to be home-made in any way, and officials have already labeled it as a “theft,” though no information has been made public as to the act of the theft itself — it would have happened around two decades ago, and information that far back may be difficult to track down.