Authorities say a 13-year-old girl was one of the social media users behind recent "scary clown threats" targeting Philadelphia schools.

The threats posted online caused alarm, prompting the Philadelphia School District and police department to issue a statement over the weekend saying disturbing clown threats had mentioned Philadelphia schools.

Police on Monday said a 13-year-old girl who attends an unspecified local school had been identified as one of the people who posted the messages.

The girl told investigators that the threats, which she posted with a friend, were a "prank only," according to police. The girl said the two never intended to harm anyone.

She was identified in part due to tips from the public, police said.

The District Attorney's Office is now reviewing the case.

Philadelphia public schools and administrative offices are closed Monday for Rosh Hashanah.

Suspicious clown sightings and social media threats have caused widespread concern nationwide in recent weeks.

Reports of suspicious people in clown costumes have been reported in several places in Pennsylvania 

Meanwhile in South Jersey, two teens from Deptford Township, Gloucester County, were arrested Monday and charged with cyber harassment for allegedly posting social media threats similar to the creepy clown threats in Philadelphia.

One of the teens charged is a 13-year-old girl who attends Bunker Hill Middle School in Washington Township, Deptford Township police said. She was charged with one count of cyber harassment, a fourth-degree misdemeanor, and released to her parents, police said.

Police said later Monday that a second teen — a 14-year-old boy — was charged with cyber harassment in connection with a separate, but similar, investigation.

It was unclear if the two had been working together.

The two juveniles will be charged with false public alarm in relation to two different social media accounts that were created and posted threats about clowns coming to kidnap and harm students and teachers specifically at Deptford schools.

Police said the teens' parents are cooperating with investigators.