The Blade in Toledo said its reporter Tyrel Linkhorn and photographer Jetta Fraser had stayed outside the gate of the Joint Systems Manufacturing Center operated by General Dynamics Land Systems.
The newspaper said its employees were stopped as they were leaving Friday and later released.
The Blade reported both were wearing media credentials.
The newspaper said police kept Fraser’s cameras, telling her photography of the plant was not permitted.
Messages left at the plant and with U.S. Army public affairs weren’t immediately returned.
A man answering a General Dynamics number Friday evening said offices were closed and messages couldn’t be left.