A private school in Dundee has expelled three pupils after cannabis was discovered on its grounds.

It has suspended a further 14 pupils, one in connection with the cannabis, and 13 over the use of e-cigarettes.

The rector of the High School of Dundee wrote to parents on Friday confirming the decision.

Dr John Halliday wrote: "Following the discovery of a small amount of cannabis on school property, three pupils in F3 have now left the school for their involvement in this incident.

"A further pupil has also been suspended and given a final warning but will be allowed to return to school after half-term, subject to strict monitoring of behaviour.

"The parents of the pupils in question have been consulted and are aware of the reasons for the school’s decision in this matter.

"As I intimated last week, the school immediately notified the police, who are conducting their own investigation.

"We obviously cannot comment on their investigation but I can reassure you that no pupil still at school is under investigation by the police.

"I would also like to confirm that, having conducted our own thorough and vigorous investigation, interviewed those involved and decided on which sanctions are appropriate, we now consider this matter to be closed."

The rector had previously written to parents on the subject of e-cigarettes, which are banned in the school.

All of the expelled and suspended pupils are in third year. Fees at the school in the centre of Dundee are almost £11,000 per year. The letter came a week after the incident was first highlighted to parents by the school management.

Dr Halliday wrote: "As you are aware we were also looking into the use of e-cigarettes in school by some F3 pupils.

"Again this is something we take seriously and as a result 13 pupils have been suspended and given clear warnings as to their future involvement in such incidents and guidance to help them make good choices.

"The school has a strict and robust anti-drugs policy which is implemented fairly in the best interests of all our pupils.

"As I mentioned, the school also views breaches of its clear anti-smoking policy as a serious matter. I and my senior colleagues have been addressing these incidents directly and believe that we have taken appropriate action in support of the school’s standpoint that such behaviour cannot be tolerated.

"We understand the temptations that society provides so openly for our young people. Our policies are in place to protect our pupils and to help them make good choices in life."

Mr Halliday added that he felt "disappointed" the pupils had "let themselves and the school down".