An FBI affidavit claims that a security expert who was pulled off a flight last month for sending tweets about hacking into a plane’s controls admitted to briefly taking control of an aircraft and causing it to fly sideways.

According to an application for a search warrant filed in federal court, Chris Roberts told FBI agents in February that he had hacked into the inflight entertainment systems on airplanes manufactured by both Boeing and Airbus 15 to 20 times between 2011 and 2014. In one instance, the document claimed, Roberts said he infiltrated the airplane’s thrust management computer and momentarily took control of an engine. Roberts did not specify when he had done so.

Roberts reportedly told the agents that he was able to overwrite the code for the thrust management computer. When he ordered the hacked engine to climb, the plane moved sideways as it flew.

The document, which was first reported on by the Canadian news service APTN, also claims Roberts was able to monitor air traffic using the cockpit’s own system.

Roberts made news last month, when he was denied the opportunity to board an April 18 United Airlines flight from Denver to San Francisco, where he was going to speak at a security conference. On April 15, Roberts had been pulled off a United flight in Syracuse, New York and was questioned for four hours after tweeting that he could make the plane’s oxygen masks deploy, a remark that drew the attention of the FBI.

In Syracuse, FBI agents seized Roberts’s two computers, along with several hard drives and USB drives. The application made public Friday was for a warrant to search those items. Roberts has not been charged with any crime in connection to his alleged activities.

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Evangelist Dina Amelia Kalmeta is the Founder and CEO of Your New Life in Christ Ministries - CWW7NEWS. Evangelist Dina reports on world events as they pertain to Bible Prophecy. Before Your New Life in Christ Ministries, Evangelist Dina served as a Leader for INCHRIST NETWORK leading teams online and spreading the Gospel of Jesus Christ. Her mission today is to bring hard evidence that what is taking place in the world isn't just coincidence, but indeed proof that the last days the Bible warned us about are upon us right now.