Police are searching for the thieves who robbed a cellphone store and held the clerks and customers hostage.Greenfield police said the armed robbery happened Nov. 30 at the Verizon store at South 76th Street and West Edgerton Avenue.It was described as a "takeover robbery."The masked men entered and forced nearly two dozen people into the back of the store."To round up people during store business hours and force them into the back, anything could've happened," Detective Greg Hoppe said.The robbery was captured on store surveillance video."You get a pretty clear shot of his face. If you know this person, you will recognize him," Hoppe said.In the back, scared customers, including children as young as 8, were forced to keep their hands up as the pair pillaged the storage room."That's a pretty heinous robbery," Hoppe said. "Robberies in themselves are violent and traumatic; now you have it when you're ushering people against their will and herding them, for lack of a better term, into the back room. They have no idea what's going to happen to them."Thieves also hit a Sprint store Dec. 1 at South 78th Street and West Layton Avenue.The customers and clerks again were forced to the back at gunpoint in another takeover robbery."The only way to escalate this, unfortunately, would be to discharge their firearm, which obviously we want to stop them before it would ever get to that point," Hoppe said.In total, they made off with $80,000 worth of smartphones.Police think the thieves are reselling the phones out of state or overseas.Anyone who recognizes the men was asked to call Greenfield detectives.