It's not clear what led up to this, but police surrounded a dump truck on the freeway with a man who had gotten out and climbed on top of a pile of what looked like gravel or asphalt in the back.
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For a moment it looked like he was going to give up and surrender.
He then appeared to throw whatever was in the back of the truck at officers, and so they moved in and arrested him.
He was then taken away on a stretcher.