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BURLINGTON, N.J. — Concerned families in a New Jersey town received a letter from police and school officials after “disturbing” posts were found online regarding the Burlington Township school district and so-called “creepy clowns.”

“We are sending this e-alert in reference to the rash of ‘creepy clown’ sightings and threats that have been circulating around the nation,” the letter (embedded below) from the Burlington Township school district and police department begins.

Police are investigating the threats and “pursuing those responsible” for the social media posts, but have determined there is no credible threat.

Still, students and parents may notice an increase in police presence at township schools, police said.

The letter was sent as other cities around the nation are dealing with the bizarre trend of people dressing up as clowns and menacing communities – at times, becoming violent.

In Ohio, all schools in a Cincinnati district were closed after a woman reported she was attacked by a man dressed as a clown. That man allegedly threatened students during the assault.

Creepy clown sightings have been reported in New York, as well. But New York City officials said there is no credible threat and urged residents to not “believe the hype, and don’t be afraid of the clowns.”

The letter also comes a day after police in Washington Township, N.J., said they arrested two teens for their involvement in sending threatening social media messages portraying themselves as clowns.

A 13-year-old Washington Township girl allegedly posted online threats which identified victims by name and listed their addresses and other personal information. She was charged with one count of cyber harassment after confessing to posting the messages, according to a Washington Township Police report.

In “a separate but similar case” in the same town, a 14-year-old boy was charged with cyber harassment, according to Washington Township police.

Parents in Burlington Township, N.J., received this message from police on Monday, Oct. 3, 2016. (Burlington Township Police Department)