Photo via the AP

The C-4 explosives found at New York's Marble Cemetery on 2nd Avenue Sunday (and reported to the NYPD on Monday) were made over 12 years ago. CityRoom reports that initial testing showed the eight bricks were old (though the explosives have an indefinite shelf life), because they "lacked identifying markers known as taggants, which manufacturers were required to include in the putty-like compound starting in 1997."

The closer inspection of the explosives also showed that the bricks were M112, manufactured exclusively for the military; investigators believe it was likely stolen from a base. The investigation is ongoing.