School officials at Wantagh High School are increasing security on campus after another threatening message was found, making it the third in three weeks.

The school has now banned large bags and backpacks. Books and any personal belongings must go in clear bags, which are searched at the beginning of school and after lunch. Lockers have also been sealed off for the rest of the year.

All of the school's bathrooms have been closed except for one girls' and one boys' bathroom. Three weeks ago, a message threatening to blow up the school was found written on the wall of one of the boys' bathrooms.

According to the New York State Department of Education, there must be at least one stall for every 50 males and at least one for every 50 females at a school. In a statement to News 12 Long Island, the Wantagh School District Superintendent's office says, "Our highest priority is the welfare of our students and staff and keeping our parents informed of the latest information."

After each threat was found, police searched the school and found nothing. Anyone with information on who made the threats is asked to call Crimestoppers at 1-800-244-TIPS.