The amended complaint on Thursday also accused two others identified as former intelligence agents for the United States and Britain of conspiring with Qatar to carry out the hacking.
Lawyers for Mr. Broidy describe Kevin Chalker, founder of the New York-based firm Global Risk Advisors, as “a former C.I.A. cyberoperative” and David Mark Powell as “a former British intelligence operative who runs G.R.A. operations out of Qatar.”
The complaint says that Mr. Powell opened the firm’s Qatar office in October 2017, “just weeks prior to the commencement of the attack on the plaintiff,” but offers no other details or evidence of a role. Mr. Chalker and Mr. Powell did not respond to requests for comment relayed through their firm.
The fragments of conversation with Mr. Muzin appear to be the strongest evidence disclosed in the complaint that connects Qatar with the hacking.
Mr. Muzin told his old acquaintance that “Broidy’s name comes up in embassy meetings often” with Qatari diplomats, the complaint states. “I definitely identified him as somebody who was not, didn’t like them too much,” Mr. Muzin said, and “they knew he had been influential” with the White House.
Speaking after the first articles based on the leaks had appeared, Mr. Muzin knew in advance that “there is more stuff coming,” the complaint says.
But the complaint does not specify the source of his information, and adds that Mr. Muzin said his knowledge did not make him responsible.
“I did not cause the Broidy stuff, just because I have information,” Mr. Muzin reportedly said of the leaks. “I don’t know all the details, but I know that I am hearing repeatedly that there’s a lot more coming.”