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Two people suffered minor injuries during an armed robbery Thursday at a Starbucks in Glen Ellyn, police said.

One of the people injured was a 22-year-old man who was robbed of a computer he had intended to sell to another man at the coffee shop at 691 Roosevelt Road, police said.

The man had advertised the computer on Craigslist and arranged to meet the potential buyer at the coffee shop.

Bill Holmer, Glen Ellyn’s deputy chief of police, said the victim got nervous after talking with the “buyer” and attempted to walk away. The “buyer” then attempted to take the computer by force and used a small knife to cut the seller.

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A Starbucks employee attempted to assist the seller and was also injured by the knife. The robber ran out of the coffee shop with the computer.

Holmer said both the seller and the employee were treated onsite by paramedics and did not require hospitalization.

The robber was described as a bearded black man, about 6-foot-4 with a large build. He was wearing a gray hooded sweatshirt and black pants.

Holmer said police interviewed a number of witnesses who were at Starbucks at the time of the robbery and are also reviewing surveillance footage. Holmer said the two men communicated about the sale through text messages. Holmer said police are attempting to track the phone used by the robber.