Parents and pupils have marched from Cwmcarn Village to Cwmcarn High School today to show support for the school.
The site shut last year after abestos was found.
Parents and pupils have told ITV News that they are worried about its future.
More top news
Gruffydd Wyn Roberts, a 22-year-old from Amlwch on Anglesey, received a standing ovation as he performed Nessun Dorma.
A second man who tried to help at the incident was also taken to hospital
Police in Cardiff are appealing for witnesses after a man was confronted by a burglar carrying a knife.