After a weekend of violent and fiery protests in L.A. against ICE in the city and the county … the U.S. Marines are being called in to bolster National Guard troops and local cops in confrontations with crowds.

An eye-popping 700 Marines are set to roll into L.A. over the next 24 hours — with military officials saying they’re being sent to keep the peace, as ICE raids targeting undocumented immigrants have provoked a heated — and sometimes violent — public response.

But, the tense protests are taking place in anything but a war zone, where the Marines are usually deployed … the LAPD tells us there have been no reported deaths or homicides over the past 4 days of demonstrations in downtown L.A. and other areas.

These troops have been trained in crowd control, de-escalation, and when to use force — but the plan is to cool things off, not light a match.

The Marines are stepping in as street tensions keep boiling — with three straight days of chaos, violence, vandalism, torched cars and nonstop standoffs between protestors and authorities.