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There is likely to be a walkthrough on that site or even on this one [URL]http://ukwalkthroughs.com/[/URL] that will give you detailed info on how to get by the level.
From what I remember you just have to run away from them until you can get each of them on their own. Then you come across a few with guns, you have to kill one of them quickly to get their gun and then use that to take out the others from a distance.
Just keep trying and you'll get by it after a few goes.