A Civil War-era shell which a man tried to donate to the Army Heritage and Education Center caused a lockdown of the facility for about an hour Monday when employees thought the shell might be live. Jack Giblin, education director, said the man was trying to donate the shell, which he found in the Conodoguinet Creek, but a security guard recognized that it could still be dangerous.

Employees cordoned off the area and called the Carlisle Army Barracks, which notified Pennsylvania State Police. The shell was taken to a bomb disposal unit in Maryland. Giblin said he did not know if the shell was live, but it was treated as such as a safety precaution....