The Federal Bureau of Investigation executed a search warrant against a 16-year-old Massachusetts resident in connection with the massive Twitter breach.

According to a New York Times report, on Sept. 1, authorities raided the home of a 16-year-old boy who may have played an “equal, if not more significant role” in the infamous July 15 hack, which resulted in millions of followers of high-profile Twitter accounts being falsely offered 2-for-1 “giveaways“ for any Bitcoin (BTC) sent.

The investigation revealed that he may have posed as a Twitter employee or contractor to fool legitimate ones into entering their login credentials to fake websites where he could then capture them.

The report stated that the teenager coordinated the Twitter attack, starting in May with 17-year-old Graham Ivan Clark, the alleged mastermind. While Clark was discovered through his Discord chat records, the unnamed teenager reportedly used encrypted messaging systems like Signal and Wire, making it harder for investigators to identify him.

The unnamed individual could be the fourth charged following an investigation by the FBI, the Internal Revenue Service, the U.S. Secret Service and local authorities. Clark was arrested on July 31 on 30 felony charges. In addition, 19-year-old U.K. resident Mason John Sheppard and 22-year-old Florida resident Nima Fazeli have also been charged by federal prosecutors.

On Aug. 4, Clark pleaded not guilty to 17 counts of communications fraud, 11 counts of illegal use of personal information, one count of organized fraud over $5,000 and one count of illegally accessing a computer or electronic device. He is currently in jail awaiting trial. His bail is set at $725,000.

The FBI has not yet pressed any charges for the youth for his alleged involvement in the incident, which resulted in Twitter users sending 12 BTC — roughly $144,000 as of this writing — to different addresses posted during the attack.