(Portland, OR)  --  Three suspects are in custody, following a string of armed robberies.  Portland police say 18-year-old Patrick Dynell Jenkins and two underage teens each face three counts of first-degree robbery in connection with the armed holdups.  Each of the robberies took place yesterday morning, one in Northeast Portland and two in Southeast Portland.  No one was injured in any of the robberies, but police say two handguns were found in the suspects' vehicle.