Ah.

Here.

A social media profile [on Myspace (!)] of the alleged shooter (top centre) [named as Chris Madeupname Harper Mercer, top centre], contains a video featuring archive footage of the IRA, a number of images of IRA members in military uniform and a reference to an edition of An Phoblacht magazine.

Seems legit and entirely credible and not fake at all.

Anyone?

Oregon gunman identified by US media (RTÉ)

Oregon Gunman Was IRA Supporter (Sunday World)