REDDING, Calif. -

Shasta Dam was closed while officials investigated a possible security breach.

Dam officials confirmed the closure Friday afternoon. They said the shutdown was initiated after an unsecured door was discovered.

Shasta Dam was been closed to all vehicle and pedestrian traffic as a precautionary measure while security officers conducted a search.

Officials said the dam was reopened at about 6:15 p.m. and that no threat was found.