Gardaí are investigating a threat made to Tánaiste Simon Harris and his family. The threat, which gardaí are treating as serious, was posted on social media yesterday morning. Pic: Olivier Hoslet/EPA-EFE/REX/ShutterstockGardaí are concerned about the nature of the threat, which is also directed at members of Mr Harris’s family. Mr Harris previously said he will not be deterred from doing his job. Garda HQ confirmed the matter is under investigation but would not confirm the nature of the threat.