D.C. bus shelters are featuring FBI digital billboards of perpetrators in a series of armed robberies at cell phone stores.

The robberies occurred from January to March in the Maryland suburbs, mostly at Verizon and AT&T stores. The robbers took cell phones during the incidents and also took cash on some occasions, according to FBI spokeswoman Lindsay Godwin.

Authorities believe three people have been involved in the robbery series. Surveillance photos of the robbers from a March 15 robbery at a Radio Shack in West Lanham Hills are featured on the digital billboards.

Anyone with information can call the FBI at 202-278-2000.