BUILTH Wells High School will remain closed tomorrow (Friday, June 15) and will not re-open until Monday following a suspected smoke/sulphur bomb alert at the school yesterday.

A 16-year-old boy remains in custody after being arrested on suspicion of administering a noxious substand just after the call was made and Police say the investigation is ongoing.

Alternative arrangements have put in place for pupils who are due to take exams at the school tomorrow.

Around 500 pupils were evacuated from the school yesterday after staff reported concerns that a ground floor corridor appeared full of smoke, and an unknown substance.

Around 20 pupils and teachers presented various symptoms following exposure to the affected area, and a multi-agency response was swiftly initiated.

Dyfed-Powys Police is treating this as an isolated incident, which is not believed to be terrorist related and continues to co-ordinate the response in consultation with, and with the support of, partners.

Chief Superintendent Vicki Evans said: “We recognise that there may be concern among residents and visitors, and wish to reassure everyone that the area was immediately contained to minimise any risk effectively.

"Communities may experience an increased policing presence, which should not cause any alarm – this is merely to reassure and support following this incident.

"The safety of those attending Builth High School and the wider public is our main priority, and as a result we have made the difficult decision that the school will remain closed tomorrow with a view to re-opening on Monday, June 18.

"The closure also currently affects Builth Wells Leisure Centre.

"We would wish to reassure you that we are aware that the closure of the school is a significant concern for parents, children and communities; and that we are making every effort to conclude this as soon as possible.

"Contingencies have been put in place by education partners to ensure minimal disruption to those children sitting examinations."

Full details about the alternative arrangements will be provided by the school.

For updates on school closures visit the school or Powys County Council websites for up to date information.