On 24 November 2006, at 11:16, Stone was arrested for attempting to enter Parliament Buildings at Stormont armed with an imitation Beretta 92FS pistol, a knife and a "viable" bomb, after placing 8 "pipe bombs" within the grounds of Stormont. Three civilian security guards disarmed him as he entered the building, by trapping him within the revolving doors of the main lobby entrance. The security guards were injured during the struggle with Stone. Following the security breach, the building was evacuated and a British Army Bomb Disposal Unit was called to examine the suspect device. Before entering the building he had scrawled an incomplete graffito stating "Sinn Féin IRA muron the Parliament building. Later examination from the bomb squad revealed that the bag Stone had been carrying contained between six and eight viable explosive devices. Sir Hugh Orde, the Chief Constable of the Police Service of Northern Ireland, said "their potential for death, destruction and injury is being assessed" but added they were "fairly amateurish". As a result of Stone's actions, talks between political parties about power-sharing and the election of a First Minister, which had only just resumed, had to be abandoned.