Residents say repeated gunfire forced them to block streets themselves. Their neighbors warn barriers will slow firefighters and medics. SEATTLE — After weeks of gunfire near their homes, some North Seattle residents have taken matters into their own hands — building and placing makeshift barricades in neighborhood streets they said have become susceptible to gun violence spilling off Aurora Avenue. Residents near North 98th Street and Linden Avenue North spent part of the Memorial Day weekend piling dirt, gravel, logs and chunks of concrete into roadblocks that now partially block access to three residential streets near Aurora Ave. …