St John’s Primary in Radcliffe, Greater Manchester, has issued a warning that police will be patrolling the area after parents were seen smoking the drug as they collected their children from school.
In a letter to parents of the 138 pupils, deputy head teacher Deborah Binns says they need to “set a good example” for their children.
She said: “We have had concerning reports that parents have been using cannabis around the school premises as they drop off and collect their children.
“This has been reported by parents and has been noticed by some of the older children.
“This is a serious safeguarding concern and if further complaints are brought to our attention, we will notify the relevant authorities.
“We have informed the community police service and they are likely to be keeping a close eye on the situation.