(Portland, OR) -- The Portland Police Bureau is taking steps to crack down on gun violence near Dawson Park.  Authorities say they are increasing vehicle patrols in the North Portland neighborhood and launching a new bike patrol in the area soon.  Two people were injured last Friday afternoon when gunfire erupted at the park, a shooting Mayor Ted Wheeler has referred to as "senseless".  Police say three people were arrested on Saturday, but they are still searching for suspects.