Looking at that last photo of the bricks around a tree, it looks they about to perform some repairs/replacement as evident of the chalk/paint marks on some of the bricks. They might be digging up that area and would need replacements. Doesn’t mean someone couldn’t come along and pick some up.
none of thos pictures, or the videos they came from, show any police actually taking bricks and placing them anywhere.
THe first two could just be normal brick deliveries.
THe last picture looks like a bunch of bricks that match the pavement. Could be people pulled up bricks to use, and then the cleanup people collected them and piled them all up at the tree, to be hauled away later.
I also think Antifa could be bringing pallets of bricks and planting them.
I have a hard time believing the police could do this in multiple cities and states, and there isn’t a single picture of them actually placing them, and nobody can get anybody to admit to it or tattle on them. maybe, but it seems incredulous, and it seems much more likely that the outside agitators are planting the bricks.