What is the name of the movie I am describing?

There is a movie that I have been wanting to know the name of. This movie is about a whole school gymnasium full of people and they have been in comas for about 10 years i think and when they wake up they start killing everyone and there is a group of about 6 people that get traped in the school with them. I havent gotten to finish the movie but I don't remember the name. Please Help!!!

Update:

Thank You sooo much yu3se6! Thank you!!!

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