The increase in traffic was actually due to spectators of the comedian John Oliver.
Within minutes, traffic to the site increased by 3.1
A statement by the FCC on Monday described a coordinated series of cyber attacks: "Multiple Distributed Denial-of-Service Attacks".
"These actors did not attempt to comment on their own, but made it difficult for legitimate commentators to access and discard the FCC," said the statement of the then Chief Information Officer of the Commission, David Bray.
The investigation and FCC chairman Ajit Pai blame inaccurate information about Bray – which Pai, a Republican member of the commission, has suggested could have had political motives.
Bray did not respond to CNN messages left on his voicemail and LinkedIn profile.
At that time members of Congress asked for information about the attack, officials from the agency met with an FBI agent and the Inspector General began an investigation.
The FCC published the press release and letters to several members of Congress where the incident was described as an attack. But within the agency, the staff treated the episode differently.
"We discovered that the FCC had not internally defined the incident as a cybersecurity incident" and that the officers had not followed their own cyberattacks, including contacting the Department of Homeland Security's Computer Emergency Readiness Team.
Instead, analyzes found that "spikes in web traffic coincided exactly with the timing of: (1) publishing information during the … episode; (2) publishing the episode in The Last Week Tonight with John Oliver YouTube Channel and (3) tweets about this release. "