Former counterterrorism official Joe Kent under investigation over alleged leaks: Sources

Joe Kent, the former Director of the National Counterterrorism Center, who resigned Tuesday, is under criminal investigation for potentially leaking classified information, according to multiple sources familiar with the situation. 

It is unclear what information might be involved in the investigation. The sources said the investigation started prior to his resignation. 

The Office of the Director of National Intelligence did not respond to ABC News' request for comment. 

This is a developing story. Please check back for updates.