The social media site Gab.com says the shooter at a Pittsburgh synagogue had a profile on their website.
The company says the account was verified after Saturday’s shooting and matched the name of the gunman mentioned on police radio communications.
A law enforcement official identified the shooter to The Associated Press as Robert Bowers.
A man with the same name posted on Gab before the shooting that “HIAS likes to bring invaders in that kill our people. I can’t sit by and watch my people get slaughtered. Screw your optics, I’m going in.”
HIAS is a nonprofit group that helps refugees around the world find safety and freedom. The organization says it is guided by Jewish values and history.
President and CEO Mark Hetfield says he wasn’t aware of the shooter’s “obsession with HIAS until this morning.”
Gab said in a statement that it suspended the alleged gunman’s account, backed up the content and notified the FBI.
Gab says its mission is to defend free expression and individual liberty online for all people.
The social media site is popular with far-right extremists.