It's still unclear who placed the plastic bag of C-4 at the foot of a tombstone in New York City Marble Cemetery on Manhattan's Lower East Side. A caretaker gardening dug up the bag in 2009, didn't realize what it was and left it. It remained until a volunteer saw it and called police on Monday.
The discovery caused a bomb scare and shut down the area until police determined it had no ignition and couldn't detonate.
NYPD spokesman Paul Browne said Tuesday the explosives were tested at a police facility and did not have an identifying piece that all military C-4 were required to have after 1997.