Authorities say two suspicious devices were found inside a Borders Bookstore at a suburban Denver mall in a case that's being investigated by the FBI.

The discovery was made Saturday at the Colorado Mills Mall in Golden, Colo., after police responded to a report of a break-in.

The Jefferson County Bomb Squad was called to the scene. The FBI later said the "crude devices" caused minimal damage to a small area inside the store.

No one was injured. Additional details on the devices were not available.

Police made no arrests, but the FBI is investigating.

The mall opened as usual Saturday, though the bookstore was closed.