welcome to bbc news. we begin in northern ireland, which is marking 25 years since the signing of the good friday agreement. the historic peace deal largely ended decades of violence in northern ireland. but uk prime minister rishi sunak says efforts must be intensified to restore the power sharing government that was central to the deal. it collapsed in the fall out from brexit and now the political dysfunction and security concerns are threatening to overshadow the historic milestone. rishi sunak willjoin the us president, joe biden, on a visit to northern ireland on tuesday to commemorate the good friday agreement. from belfast, laura cullen reports. it took 22 months of talks to largely end three decades of conflict.