Two girls have been arrested for allegedly plotting to kill a maths teacher at their school.

The girls, aged 14 and 15, were taken away by police to be questioned over the suspected knife plot to murder teacher Alison Cray at their 1,000 pupil school, in Wales.

The 15-year-old was also arrested for allegedly having a knife in her schoolbag and suspicion of making death threats at Cwmcarn High School.

The girls were allegedly discussing maths teacher Mrs Cray when their conversation was overheard. Mrs Cray was described as ‘very popular’ with other pupils at the school.

Police have stressed no-one was hurt – and that the drama ended peacefully.

Police were called to Cwmcarn High School near Newport, South Wales, at lunchtime on Thursday.

A police source said: ‘The two pupils were overheard in class talking about what they were thinking about doing.

‘A teacher was informed and the pupils were challenged. Police were called as a result.

‘It was resolved by the time the police arrived at the school. No weapon was seen in the open but a check on a schoolbag discovered a knife which was taken away.’