LONDON, Dhu-AlQa'dah 26, 1436, Sep 10, 2015, SPA -- Northern Ireland First Minister Peter Robinson said Thursday that he is stepping aside because of an impasse that threatens to bring down the Catholic-Protestant power-sharing government, AP reported. Robinson said Thursday that all but one of his party's ministers will step down immediately, gravely weakening the coalition government that is a cornerstone of the 1998 peace agreement. The crisis has intensified with police suggestions that Irish Republic Army dissidents were involved in last month's killing of former IRA member Kevin McGuigan. Robinson said this made "business as usual" impossible because of "the assessment of the chief constable of the involvement of the IRA in murder, the continued existence of IRA structures, and the arrests that followed has pushed devolution to the brink." He said he was leaving Arlene Foster in place as a temporary first minister and finance minister to prevent other parties from taking advantage of the situation. -- SPA 21:12 LOCAL TIME 18:12 GMT www.spa.gov.sa/w