(Portland, OR) -- A North Portland man is behind bars after several armed robberies connected to Facebook Marketplace. Portland Police Robbery detectives say since September, seven victims have been robbed at gunpoint in four incidents near the intersection of North Albina Avenue and Blandena Street. Three of the robberies involved meetings to buy or sell items listed on Facebook Marketplace. Police say they arrested 19-year-old Jerone Walker Friday at his home on North Mississippi Avenue. Walker is charged with four counts of robbery.