After the gate has broken open, you can enter the market. Go all the way down the street until you see big red doors and gas cans next to them. Turn right just before the gas cans. There will be a brief case you can open with a VZ61 Machine gun in it. If you look closely, the gun looks similar to the "Scorpion" sub machine gun from Call Of Duty 4. This gun will make this level much easier.