BOULDER — Police are investigating whether more people were involved in a Tuesday afternoon robbery of a medical-marijuana distributor in Boulder.

David Henderson, 40; Walter Carter, 21; Lamare McGee, 22; and Justin St. John, 29, were arrested on suspicion of robbery, criminal conspiracy, accessory to a crime, second-degree kidnapping and forgery.

The four suspects made their first court appearances this afternoon in Boulder County Jail, where each is being held in lieu of $50,000 bail.

A clinic employee told police that two men posing as customers robbed New Options Wellness Clinic of cash, two 20-gallon barrels of marijuana and its surveillance equipment just after 3:30 p.m. on Tuesday.

Police chased the quartet’s black Cadillac Escalade after neighbors of the New Options clinic, 2885 E. Aurora Ave., said it fled the scene of the robbery.

See photos from the crime scene and arrests at DailyCamera.com.