ATLANTA (AP) — Police say a device taped to a bridge over a busy Atlanta freeway was not explosive, but they haven't said exactly what it was.

Atlanta Police Department spokeswoman Elizabeth Espy says authorities on Monday found a tube-shaped object taped to the east side of a bridge spanning the downtown connector. The connector is a stretch of freeway where Interstates 75 and 85 meet in Atlanta.

Police eventually detonated the device, which charred a section of the bridge.

WSB-TV reports that a worker who saw the device told police there was an inscription: "Slow motion video. Do not move until spring."

Lanes in both directions were closed for about two hours and traffic backups extended to many surface streets. All lanes of the connector were reopened around 4:30 p.m. Monday.