A former Hialeah school teacher is under investigation after posting a series of YouTube videos in which he apologized "for not killing people's children."
Hialeah Police officials said Sunday that detectives and federal authorities made contact with the suspect, identified as David Givins.
Givins is a former Miami-Dade County Public Schools employee who taught at North Hialeah Elementary School for 13 years.
His social media posts earlier this month caught the attention of police and the FBI.
"I apologize for not killing people's children," Givins said in one of the videos. "FBI agents, CIA agents, Department of Justice people, Congress, I apologize that I failed you all in not killing people's children."
In the same video, Givins also threatened to storm his former school using armored tanks.
School district spokeswoman Daisy Gonzalez-Diego said Givins was fired in 2014 because of teacher certification issues.
She said school police spoke to family members who said they last saw him in May and that he had moved back to Washington, D.C.
According to authorities, an investigation remains open.