Police are investigating after a woman's phone was taken during an 'OfferUp' exchange in Phoenix on Monday evening.
According to the Phoenix Police Department, just after 9 p.m., officers responded to a report of a theft near 35th Street and Bell Road.
Dina Firnstahl told ABC15 she met a man on the mobile app and agreed to sell her iPhone for $300.
"Half of the place was filled with people; there was people all around, there were cameras, I felt like it was fine," she said.
According to Firnstahl, the man took the phone and tested it to ensure it charged, before he took off, hurdling over chairs and running out of the store.
Surveillance video Firnstahl obtained from the location shows her running after the man. "He booked it, he was so fast," she said.
Phoenix police recommend having a plan if you sell or buy items on mobile apps. "Take someone with you, tell someone where you're going," said Phoenix Police Detective Marianne Ramirez.
Many police stations even have "meet up" locations where people can safely exchange items like this.