British police have stopped sharing evidence from the investigation into the terror network behind the Manchester bombing with the United States after a series of leaks left investigators and the government furious.
The ban is limited to the Manchester investigation only. British police believe the leaks are unprecedented in their scope, frequency and potential damage.
Relations between the US and UK security services, normally extremely close, have been put under strain by the scale of the leaks from US officials to the American media.
After chairing a meeting of the emergency Cobra meeting Theresa May said: “I will make clear to President Trump that intelligence shared between our security agencies must remain secure.”