CASEY MCNERTHNEY (SEATTLEPI.COM) with slideshow:
Rush hour was jammed in Seattle on Thursday evening as hundreds of Occupy Seattle and union protesters occupied University Bridge.
Some protestors came north from Capitol Hill at around 4:30 p.m., while others came down from a rally at the University of Washington.
Police estimated a peak crowd size of about 600, but at one point the event looked like it reached a crowd size of about 1,000. The crowd swelled quickly as people marching from various locations met on the bridge. But the masses didn't stay long, thinning to about 300 people shortly after 6 p.m. MORE...