The Queensland Police Service is warning children to be careful when walking to and from school after a woman approached at least three children in the South Brisbane area late last month.

The incidents occurred on the 19th and 23rd of February when the woman approached school students aged 12 to 17, stating she was a teacher at their school and offering them a lift as they walked in Runcorn and MacGregor.

The woman is described as Asian in appearance, approximately 35 to 38 years old, proportionate build with black hair and brown eyes, driving a silver SUV similar to a Toyota Rav 4.