An Ohio man faces charges of harassment and aggravated menacing after a video was posted on social media that showed him firing a gun and referencing a local Jewish community center, the F.B.I. said.

The man, James Patrick Reardon, 20 , was arrested on Friday, according to the agency, and the Mahoning County Sheriff’s Office said bail was set at $250,000.

In the short video, posted on Mr. Reardon’s Instagram account on July 11, he fires a gun and the sounds of screams and sirens can be heard in the background. The video was captioned, “Police identified the Youngstown Jewish Family Community shooter as local white nationalist Seamus O’Rearedon.”

The caption was an apparent reference to the Jewish Community Center of Youngstown, an agency of the federation that offers recreational activities and support for families, and to Mr. Reardon’s handle on Instagram. The Instagram post tagged the location of the community center.