I took a close look and they seemed authentic, with a little winter salt grime and everything. How'd they get this far from home?
Is San Francisco standing in for Chicago in a movie or TV show? If so, that's pretty odd. Though maybe not as odd as it standing in for the 1980s East Village in "Rent."
UPDATE: It occurs to me that they may be here to attend the funeral of the Oakland police officers.
From the Chronicle story yesterday (boldface added):
In an emotional farewell, more than 20,000 grateful citizens and law-enforcement officials from across the country gathered Friday to honor the lives of four Oakland police officers who were shot and killed in the single deadliest day in department history.