PORTLAND, Ore. (AP) — Police have arrested a 19-year-old Portland man in connection with armed robberies that happened during meetings arranged through Facebook Marketplace. The Oregonian/OregonLive reports Jarone Walker Jr. is accused of carrying out four robberies using a handgun to threaten seven victims near a North Portland intersection. Three robberies happened earlier in April, and the first happened Sept. 29. Police say several of the robberies happened during meetings arranged through Facebook Marketplace to buy or sell property. Walker was arrested Friday and booked into the Multnomah County Detention Center. Police are investigating whether Walker was involved in additional robberies. It wasn’t immediately known if he has a lawyer.