School officials are encouraging parents to talk to their kids about “stranger danger” after three students at separate elementary schools reported being approached by a man who offered them a ride in his truck.

One child said he was grabbed by the man, but none of the students was injured. Honolulu police are investigating.

The three incidents occurred while the kids were walking to or from school in the past week at elementary schools in the Campbell-Kapolei complex.

School officials sent a letter Thursday to parents of students in that cluster of schools, urging them to tell their children to be on guard when approached by strangers.

The Department of Education offers these tips for students:

>> Stay away from strangers. Do not talk to or take anything from them.

>> Never accept a ride or go anywhere with someone you don’t know.

>> Stay more than an arm’s length away. If approached, seek help right away from a trusted adult.

>> Use the buddy system and avoid walking alone.

>> If a stranger grabs you, yell for help and do whatever you can to get away.

>> Report suspicious activity to a trusted adult.

>> Stay alert to your surroundings and let family and friends know where you’ll be.

“We just want to stress that we want parents to speak to their kids about stranger danger and try to reinforce these tips that will help keep their kids safe,” said Derek Inoshita, communications specialist for the Department of Education.