There is this alternate version reported in the NYT which is more likely (and consistent with the blog post):
> But many protesters said they believed the police had tricked them, allowing them onto the bridge, and even escorting them partway across, only to trap them in orange netting after hundreds had entered.
>
> “The cops watched and did nothing, indeed, seemed to guide us onto the roadway,” said Jesse A. Myerson, a media coordinator for Occupy Wall Street who marched but was not arrested.
—ravi