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When you've taken care of these turn around because you'll be rushed by another load of terrorists from behind. These will be a lot closer so you won't have as much time to react. Once these have been taken care of your team should have finished hacking and then you should just head up to where the first wave of terrorists came from.
If you fancy being a bit sneaky (and you hace C4 in your inventory) before you do any of the above, run and plant a few charges near the entrance of where the first wave come out. That way all you have to do is wait for the best moment to set it off, taking out lots if not all of them. ;D
Hope this helps.