An air and ground search is underway for a missing Gillette woman.  Forty-nine-year-old Ruth Martinson disappeared Monday afternoon after attending a class at Gillette College.

Gillette Police Lieutenant Brent Wasson said his office is working with the Campbell County Sheriff's office in an effort to find Martinson.

Wasson said they are also looking for Martinson's Black Toyota Tundra truck.  A separate search is being conducted by Martinson's family and friends.

Anyone with information about Martinson is urged to contact authorities.