Police are investigating after a man approached a young high school student and offered her a lift home on Tuesday afternoon.
The incident happened about 4.30pm outside Kelmscott Senior High School when a 15-year-old girl was approached by a man in a vehicle who asked for directions before offering her a lift.
The man sped off from the scene only after a staff member emerged from the school grounds, police said.
Armadale police have now launched an investigation and will review CCTV footage from outside the school.
In a letter to parents, principal Mark Jeffery warned students to be careful.
“In light of this reported incident, I urge all children to take care when going to and from school, and to report anything suspicious to their parents, the school and the police,” he said.
Mr Jeffery suggested students travel in groups, to be alert, walk on the right-hand side of the road to face oncoming traffic and to run from risky situations.
This comes after a similar warning to parents of children at Swanbourne Primary School who were also notified about suspicious activity.
In an online school alert, principal David Knox said on Wednesday afternoon, two boys were stopped by an older man on Devon Road as they walked home from school, and asked the children if he could take their photo.
A police spokesman confirmed this incident had not been reported to police.