Editor’s note: This story has been updated to correct what kind of drug was found and its estimated street value.

Charges were filed Tuesday against two women arrested last week in Temecula when 53 pounds of cocaine was found stashed inside the gas tank of the SUV they were in, authorities say.

San Diego residents Gloria Lisbeth Gue Valladolid, 43, and Juana Araujo Vasquez, 30, each were charged in Riverside County Superior Court with possession and transportation of narcotics and controlled substances. They pleaded not guilty Tuesday afternoon.

U.S. Border Patrol agents arrested the pair Thursday night near Jefferson Road and Rancho California Road in Temecula, jail records show.

Border Patrol spokesman Mark Endicott said the women were occupants of a 2002 Ford Explorer that was transporting 53.24 pounds of cocaine, with a street value of almost $700,000. The Border Patrol had been alerted to the SUV by a Riverside County sheriff’s K-9 unit.

The suspects were arrested and turned over to the Riverside County Sheriff’s Department. They are in custody the Larry D. Smith Correctional Facility in Banning. Bail is set at $1 million.

Initial field testing had shown the drug was fentanyl, a powerful opioid causing a drug epidemic nationwide. But Endicott said Wednesday that it was actually cocaine.