US Secretary of State Hillary Clinton has strongly condemned the murder of David Black and applauded the efforts of the PSNI to bring the perpetrators to justice.
"There is no justification for this outrageous and cowardly act. I offer my sincere condolences to the family, friends and colleagues of Officer Black, who had a long and distinguished record of service," she said.
Earlier, Taoiseach Enda Kenny strongly criticised the "criminality and drug dealing" of the dissident republicans suspected of murdering Mr Black.
Standing shoulder to shoulder with the North's First Minister Peter Robinson and Deputy First Minister Martin McGuinness, Mr Kenny said there was a "warped mentality" among dissident republicans.
At a meeting of the North-South Ministerial Council in Armagh, Mr Kenny said dissident republicans were linked with criminality, drug dealing and extortion which had led to deaths on the streets of Dublin as well as the murder of Mr Black.