In this Tuesday, July 31, 2018, photo, an FBI employee works in a computer forensics lab at the FBI field office in New Orleans. More than 20 people working for the FBI headquarters in Louisiana are working on cyber security. They include experts working at forensics labs, doing forensics on computer hard drives and developing techniques for analyzing computer memories in efforts to fight and find intruders, according to the special agent in charge of the FBI's New Orleans field office. (AP Photo/Gerald Herbert)
This undated image posted on social media by the FBI shows Anthony Quinn Warner. Federal officials now turn to exploring the monumental task of piecing together the motive behind the Christmas Day explosion that severely damaged dozens of buildings and injured three in downtown Nashville, Tenn. While officials have named 63-year-old Warner as the man behind the mysterious explosion in which he was killed, the motive has remained elusive. (Courtesy of FBI via AP)
In this file photo, then-acting FBI Director Andrew McCabe listens on Capitol Hill in Washington, Thursday, May 11, 2017, while testifying before a Senate Intelligence Committee hearing on major threats facing the U.S. (AP Photo/Jacquelyn Martin) ** FILE **