U.S. Park Police are facing criticism for handcuffing three teenagers who were selling water Thursday on the National Mall.

Officials said police were just doing their job, as the teenagers were vending in a prohibited area, WUSA9 reported.

Bystander Tim Krepp took a photo of the incident, and told WUSA9 that he thought the officers went too far in handcuffing the teenagers. The image quickly went viral on social media.

The teens were given a verbal warning and released to their guardians, WUSA9 reported.