Florida deputies have arrested a second 19-year-old man who shot at undercover deputies outside a mall on Monday when a gun buy operation went awry and turned into armed robbery, authorities said. Jaycob Riley was located and arrested Wednesday night, the Hillsborough County Sheriff’s Office said in a news release. Riley was the second suspect allegedly involved in the shooting outside the Westfield Brandon Mall. The other suspect, 19-year-old Jordan Gracia, was arrested shortly after the incident.