Dyfed-Powys Police responded to an incident at Ysgol Maesydderwen Comprehensive School in Ystradgynlais on Monday after a threat was reportedly made over the telephone.

The school went into lockdown as a precaution.

All pupils and staff were released safely from the school during the afternoon. There are no reports of any injuries.

The school will remain closed on Tuesday.

Live updates are available below.