(Portland, OR)  --  Police say they received hundreds of calls over illegal street racing over the weekend.  The unified command law enforcement structure says Portland's emergency dispatch system was "flooded" with calls Saturday night about the racing events that blocked off whole intersections in two separate parts of the city.  Police say the racing and stunting started at Northeast 15th Street and Killingsworth Avenue and eventually moved on to Northeast Martin Luther King Jr. and Columbia boulevards.  Police say participants could be cited or even arrested.