So sez the NI police chief, under a tremendous amount of pressure from above to point a finger at someone, so he conveniently points it at the IRA, offering no proof whatsoever, and sending the DUP echo chamber into high gear.

The police are certtain of this? Brilliant. Let them prove it in a court of law, rather than the court of public opinion, then.

The IRA may or may not be involved. But there is a little thing called the JUSTICE SYSTEM where these things are rightfully followed through upon, NOT A PRESS CONFERENCE.