Security guards restrain Michael Stone, center, one of Northern Ireland's most infamous Protestant militants. Stone was seen Friday throwing a bag into the foyer of Stormont Parliamentary Building in Belfast. The bag contained six working pipe bombs.

Belfast, Northern Ireland ? Belfast’s most infamous militant stormed into the Northern Ireland Assembly headquarters Friday with a bagful of pipe bombs, forcing an evacuation that overshadowed the politicians’ failure to meet a deadline for forming a new Catholic-Protestant administration.

Two security guards trapped Michael Stone – an icon of Protestant extremism because of his 1988 grenade-and-gun attack on an Irish Republican Army funeral – halfway inside the brass revolving door of Stormont Parliamentary Building.

Stone, a long-feared figure who boasts of his desire to kill Sinn Fein leaders, repeatedly screamed “No surrender!” as one guard twisted Stone’s arm and another pulled a handgun from his jacket.

British army experts using remote-controlled robots later discovered at least six working pipe bombs inside a bag he was carrying, police said.

Stone’s thwarted attack came on the day when a Catholic-Protestant administration, the central aim of the Good Friday peace accord of 1998, was supposed to be resurrected after four years of deadlock.

The British and Irish prime ministers, Tony Blair and Bertie Ahern, spent months insisting that Friday would be their final, nonnegotiable deadline for the major Protestant party, the Democratic Unionists, to forge a coalition with its Sinn Fein enemies. The premiers reluctantly retreated from that ultimatum by saying that only the top two positions in the envisioned 12-member Cabinet must be filled by the deadline.

But the Democratic Unionist leader, Ian Paisley, an 80-year-old evangelist who has been a bulwark against compromise with Catholics throughout the four-decade conflict over the British territory, told the Northern Ireland Assembly that the time was not yet right for him to take the top post of first minister. Paisley said he would cooperate only after Sinn Fein formally recognized the authority of the police force in Northern Ireland.