Jungwirth has been charged in connection with online threats made in his name, and police said Facebook posts on Aug. 30 mentioned the Pulse nightclub massacre in Orlando and made threats planned for Labor Day weekend in the Wilton Manors area.
The threats stated: "None of you deserve to live," and "If you thought the Pulse shooting was bad, wait till you see what I'm planning."
WFTV spoke with Jungwirth's mother Sunday.
“Are you concerned about him?” asked WFTV reporter Angela Jacobs.
"I was, but the FBI just left," she replied.
But his mother said she could not comment on her son’s arrest.
His attorney, Ron Baum, did not respond for comment.
The Associated Press contributed to this report.