The federal agency ICE is completely captured by fascists. They are arbitrarily staging immigration crackdowns using hastily deputized agents who arrest people off the street while hiding their identity. They came to Los Angeles, a fervently anti-fascist area. It triggered massive but mostly peaceful protests, and some protestors wave Mexican flags like OP's picture.
Trump is using the protests as a pretext to claim this is an invasion, so he can mobilize the federal military against citizens. The protests are getting more chaotic (by design, since military presence is exacerbating tensions), which causes the police violence to increase, in a vicious cycle.