The South Dakota Highway Patrol seized 21 pounds of methamphetamine and one kilogram of cocaine Monday east of Rapid City during a traffic stop.

A trooper stopped a car shortly after 1 p.m. on Interstate 90 about 10 miles east of Rapid City for a traffic violation.

A drug dog detected something in the car, and a search was conducted. Troopers found six grams of crystal meth and a pipe. Continued searching resulted in the discovery of a hidden compartment in the vehicle, which held 21 pounds of crystal meth and one kilogram of cocaine, which equals about 2.2 pounds.

The names of the people involved have been withheld pending investigation.