If it's been blowing a while then, I would look at replacing the gasket/gaskets (depending on whether you have the one piece item or the individual ones). Hopefully as Lee suggested they have just come loose (possibly to the point of falling out, so may look as if they have broken) and then could simply be replaced and or tightened (carefully). Biggest ball ache there is removing the turbo heatshield to access all the manifold bolts to make sure they are all tightened correctly.
P.S. if you are replacing the individual manifold gaskets, make sure they are on the right way up, If not you will complete the job and find it is still blowing, as a few on here have in the past...
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