Scott Smith, assistant director of the FBI's Investigation Cyber Division, testifies during a Senate Armed Services Committee hearing in Dirksen Building on cyber-attack defense on October 19, 2017.

Three top cybersecurity officials at the FBI are stepping down, The Wall Street Journal reported, citing people familiar with the matter.

The departures come at a particularly sensitive time for cybersecurity concerns in the U.S. as special counsel Robert Mueller investigates Russian interference in the 2016 election and top intelligence officials warn of continued Kremlin attempts to attack the American election system.

The Journal reported that David Resch, a cybersecurity head in the agency’s division that handles investigating financial crime and organized crime; Scott Smith, assistant FBI director and head of the Bureau’s cyber division; and Smith’s deputy, Howard Marshall, have either already departed or will leave within the month.