Police are looking for 4 men who robbed several victims trying to buy a iPhone 7 through an app called "Letgo" late Wednesday.
Officers said the robbery happened just after 10 p.m. in the parking of the Red Roof Inn on North Sheridan Road at Admiral.
Police say the victims agreed to meet with the sellers at a nearby Denny's restaurant.
Officers said one of the four suspects who had set up the meeting had a gun and robbed the victims, taking their wallets and cell phones.
The four suspects then get got into a black newer model Jeep Cherokee and took off heading north on Sheridan.
Police say none of the victims were injured in the robbery.