Parents at Kellenberg Memorial High School are on edge.

For the fourth day in a row, there was a threat made to the school.

The Uniondale campus was searched for an explosive device, according to Nassau County police. They say nothing was found.

“I hope it won’t get to the point that I will say that I don’t feel comfortable to send my son to school," said Kasia Dzuria, a parent at Kellenberg High School.

Earlier on Friday, students and staff at Freeport High School were evacuated after police got a call about multiple bombs and gunmen. The Freeport mayor said it turned out to be a hoax.

According to Nassau County police, this brings the total number of school threats in the county in the first two weeks of September to 31. There were only four school threats during this time last year.

Suffolk County has also seen several school threats this month, but police could not provide an exact number.

Lauryn Stillman, a clinical manager at CN Guidance & Counseling Services, said that families have been coming in for help because of these school threats.

“They’re just concerned for their children, and they’re concerned about what’s going on in the world,” she said. “Take those moments to have the conversations with your kids. Ask more about the day rather than just how was it.”

According to Stillman, children can cope better when they sleep and eat well. Limiting social media time can also help.