Theresa May is to raise the issue of information leaks with Donald Trump when she meets him in Brussels later Thursday.
The Prime Minister and the US president will be in the Belgian capital for a Nato summit, and she is expected to confront him over media leaks regarding the Manchester attack investigation.
On Wednesday, UK officials were left furious after pictures of the immediate aftermath of the bombing were leaked to media in the US by American intelligence officials.
Images showing the remains of a backpack, coupled with shrapnel and various bits of metal, as well as claims the family of bomber Salman Abedi had warned the authorities he was dangerous, were published in The New York Times.
This has sparked a major row across both sides of the Atlantic, and a BBC report claims UK authorities have now stopped passing information to the US as a result.
Downing Street, the Home Office, and the police refused to comment on the BBC report, but the leak was condemned by the National Police Chiefs' Council on Wednesday, particularly as US politicians began to speak openly with the media about what they had learned.
The body said it underminded the current investigation, and affected the confidence of witnesses, victims, and all the families affected.