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the belt didnt snap when it wasnt running , did it , so if it is snapped then it was running wasnt it , therefore the engine could be scrap , but not all engines lunch themselves when the belt goes ...
Have you looked at the belt?
If it has snapped you should clearly see it, but may have to remove a cover in order to do so.
If you cant see it and it has still snapped, it may not make a grinding noise as such. You will find that the engine spins over faster as its only turning the bottom and not the top end when you turn the key.
Again, it may not have snapped, but the teeth may have stripped, this would give the same symptoms.
Most cars allow for clearance between the valves and the piston heads, but some dont and you can trash your engine.
My first car was a Mk4 Golf which a friend of mine gave to me . When he was on the motorway the belt snapped when he was doing 60mph, He had to spend £1100 fixing it but it was repairable. (this is going back 8 years) . A friend who ran a garage did it at mates rates. It caused a world of damage.
First port of call take a look at the belt and see if it has actually snapped, you'll soon tell if there isnt one there, most engines make it reasonably easy to see the top cam(s) if there is no belt there, then there's trouble ahead.
I got lucky with a dodge neon that had a water pump seized on it, as soon as it started spluttering I coasted in neutral to a stop, replaced belt and pump all good again.
Grinding noise could well be the water pump if its seized up.