Easy
After reaching your two team-mates in the street, do not go near them. Instead, go inside the little room without a wall on the with the blue poster thing on the ground. Go up the stairs, and once you have the uzi, use it to pick off the two guys standing on the platform across from you. Once they are "taken care of", use your AK47 (single shot conserves ammo) to pick off the guys near the cars, near the museum and over the other side of the intersection at the rubble.
More tricks, tips and cheats for this game are right here - Black cheats
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