Oklahoma City Zoo officials say a Sumatran tiger escaped its pen, but remained in an enclosed area before being tranquilized with no injuries and no danger to the public.

Zoo spokeswoman Tara Henson says the female tiger disappeared from its habitat shortly before 2 p.m. Thursday. It prompted the zoo to issue a "Code Red," meaning the public and staff are moved to a safe place because an animal is out of its designated area.

Henson said staff quickly found the tiger and shot it with a tranquilizer dart.

Henson said she didn't know how far the tiger strayed, but said it did not enter any area accessible by the public.

Henson said it wasn't immediately known how the tiger left its area.