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A head teacher has warned parents that children as young as six are simulating rape and drug use which they have seen from the game Grand Theft Auto V.

Morian Morgan, head of the Coed-y-Brain Primary School in Llanbradach, South Wales, sent a letter to pupil's parents warning them of the "extremely concerning behaviour" of some of the children.

According to Morgan, some children have been "initiating games that involve simulating rape and sexual intercourse" and "having detailed discussion of drug use".

He added the children have also been having conversations about sexual acts as well as "play acting extremely violent games that sometimes result in actual injury".

Staff at the school believe the children are behaving in this way after watching or playing GTAV, the latest instalment in the hugely successful Rockstar Games franchise.

The game, which has received huge amounts of criticism for its violence scenes and alleged misogyny, has an 18 certificate.

Morgan said he sent the letter in order to make the parents aware of their actions rather than criticising them for their children's behaviour.

He told South Wales Argus: "I sent out the letter with some trepidation but I'm pleased I sent it because all the comments, as far as I'm aware, have been very supportive.

"Until I went online and checked the content of this game, I thought it was just a bit of swearing and some shooting and I think some of the parents will tell you that they have been equally naive.

"But I must stress it's not a matter of me condemning parents at all."

Morgan added the behaviour by a minority of the children of the school is probably a more extreme version of acting out "cowboys and Indians" like when he was a child.

"It became more concerning because this newest version seems to be even more shocking than the previous games," he said.

"The youngest child showing this kind of behaviour was a six-year-old but that is unusual. It was very much a minority re-enacting these acts."

The game was released last September and has sold more than 3.7 million copies in the UK alone.