Police investigating the Manchester Arena bomb attack have stopped sharing information with the US after leaks to the media.
UK officials were outraged when photos appearing to show debris from the attack appeared in the New York Times.
The US's acting ambassador to the UK "unequivocally condemned" the leaks in a BBC radio interview.
"We have had communications at the highest level of our government ... we are determined to identify these leaks and to stop them.".
Meanwhile, the Queen has been to the Royal Manchester Children's Hospital visiting some of the injured as well as members of the emergency services.
The arrests have been "significant" while searches of premises have also yielded items "important to the investigation", Greater Manchester Police said.
Greater Manchester Police hope to resume normal intelligence relationships - a two-way flow of information - soon but is currently "furious", the BBC understands. »