Thirty minutes after being released from the Montgomery County Detention Center, a man committed an armed carjacking, police said.

Guaymar R. Cabrera-Hernandez (Courtesy of Montgomery County Police)

A 38-year-old woman was approached by a man wielding a knife and a brick as she was sitting in her car at the Islamic Education Center in Potomac, Md. The man, who police have identified as 24-year-old Guaymar R. Cabrera-Hernandez, put the knife on the woman’s neck and demanded she exit the vehicle. After she was out of the car, he threw the brick at her, got in the car, and then sped out of the parking lot.

When investigators asked about recently released inmates from the detention center located a mile away, they learned that Cabrera-Hernandez had left custody about half an hour before the carjacking. His clothing matched the description that the victim gave, and she identified a photograph of Cabrera-Hernandez as the suspect. Police got a warrant for armed carjacking, armed robbery, and first degree assault.

Two days later, officers were called to River Road and Little Falls Parkway in Bethesda to aid MPD and the United States Secret Service after a vehicle that had been carjacked from D.C. fled to Montgomery County. The suspect, found on the D.C. side of the Maryland border, was identified as Cabrera-Hernandez. Montgomery County police said he admitted to the Potomac carjacking and remains in MPD’s custody for the carjacking he allegedly committed in D.C.