These are the vandals controlled by the Hugo Chavez regime. Red circles point to weapons. These young people are murderers and vandals at the service of the regime.
They all carry pistols and/or rifles. They are the "popular" army of the revolution. They were sent to the universities to shoot dissenters and vandalize public and private property. Caracas looks like Gotham City while Chavez is the Venezuelan equivalent of the Joker.