A Newport high school has been closed for the day because so many staff and students are ill.

The head teacher at St Julian's High School said an outbreak of sickness and diarrhoea among staff and students had reached a "critical level".

The statement from the school added: "Following full consultation with the Chair of Governors and Local Authority, we have made the decision to close the school on Friday, December 6.

"The school will undergo a deep clean in an attempt to minimise further cases."

The school, which has 1,500 students, is due to re-open on Monday as normal.

St Julian's School, Newport

The news comes as it was revealed that more than 80 pupils are off sick at a popular Cardiff school.

Marlborough Primary School in Roath has been hit with a wave of sickness with dozens of pupils missing classes.

On Thursday it was confirmed 82 pupils and and seven staff members have been absent due to cold and flu-like symptoms this week.

A spokesperson from the school said: "A number of pupils and staff have been absent from school this week with cold and flu-like symptoms.

"Parents and the wider school community have been very supportive of the school during this time and following advice from Public Health Wales, are reminded to keep children home until they have made a full recovery."

Last week, almost 200 pupils were off sick at a school in Carmarthenshire.

The sickness outbreak has hit students at Ysgol Bro Myrddin in  Carmarthen , affecting almost a quarter of the student population.

Explained: How to tell the difference between a cold and the flu