The primary school is in the village of Rhoose, approximately five miles outside Barry in the Vale of Glamorgan.
The school also has a nursery unit.
Police have said a car overturned outside the school and that casualties have been taken to hospital.
More top news
A hacker group who claimed to be behind a cyber attack on Sony Pictures have posted a message online apparently mocking the FBI.
The returns of Benedict Cumberbatch's detective and the X Factor judge were among 2014's most tweeted TV moments in a billion conversations.
A family has issued an appeal to help find their missing pet turkey - in case he gets gobbled up as someone's Christmas dinner.