"They were approached by someone wearing black skin pants, black shoes, grey/white sweatshirt," read the post.
"His head was covered with a mask/hood with red nose and two small eyes."
"This person asked the child to come to him, which they didn't. He then proceeded to follow the child and tried to grab the child's bag whilst they were riding their bike.
"The child rode further and spoke to a lady who advised them to carry on to school. The child came in to the office and we have since notified the police."
A police spokesperson said they received a report at around 8.50am of an unidentified person approaching a student on a bicycle in Waikanae.
"Police conducted area inquiries and have not yet located the person involved," they said.
"Police continue to make inquiries."
Vidulich said today he had no update from police, but there was no need for students to change their behaviour.
"We still want kids to be able to ride their bikes and walk to school," he said.
"We want normal behaviour and travelling to and from school to continue, but just be aware of stranger danger."