Advice from an old hand; practice hitting the floor with all your gear on. Also, first consideration is your own personal safety, then photos, so make sure you identify cover before stopping to shoot, and keep out of the way. Apart from straight up bad luck, most injuries to journalists in conflict areas are when they leave cover by sticking their heads up out of an armoured car, or around a wall, or something like that, to see what's going on. Probably the best thing you can do is go in with the SWAT team, as they will look out for you.
Equipement wise, wide zoom with a flash on your main body, medium wide on a back up body, and long zoom in a pocket. You probably want to hold off on the flash until the situation is under control, so put that in a pocket as well. Lose your should bag and get a belt pack. If you're wearing body armour, becareful of your camera straps. That stuff is heavy and you can't feel the straps through it, so it's easy to have a camera slip off your shoulder without noticing. Get a pair of light hiking boots, as who knows what's going to be under foot.
Good luck, wish I was going with you!
David Buzzard