"'He looked all of us in the eye and said, 'I swear to you, there are buses waiting across the bridge,' ' Mr. Bradshaw said.

But on the bridge there were four police cruisers parked across some lanes. Between six and eight officers stood with shotguns in their hands, the witnesses said. As the crowd approached, the officers shot over the heads of the crowd, most of whom retreated immediately, Mr. Bradshaw, Ms. Slonsky and Ms. Golden and her son said."