Ariana Grande announces benefit concert for Manchester victims

In a statement, a spokesperson for the National Counter Terrorism Policing underscored the importance of the trust between US and British law enforcement officials and said "when that trust is breached it undermines these relationships, and undermines our investigations and the confidence of victims, witnesses and their families".

Grande wrote of the unifying power of music and appealed for people to come "closer together, to help each other, to love more, to sing louder and to live more kindly and generously than we did before".

A USA law enforcement official later authenticated the photos and said they had been provided by British authorities to American investigators, CNBC reported. Though it's unclear if the newspaper obtained the information from US officials, the story has angered many British officials and distressed the families of the victims. The act prohibits them from sharing sensitive information regarding national security but also prevents them from sharing security information involving other countries.

British Prime Minister Theresa May said she plans to raise the issue with President Donald Trump at the North Atlantic Treaty Organisation summit in Brussels. The statement went on to say the damage is greater when information is leaked in the middle of a major investigation.

British home secretary [interior minister] Amber Rudd had already made clear her annoyance after American media published the bomber's identity and details of the investigation before British officials felt ready to disclose them.

With Britain's terrorism threat level at "critical", meaning a new attack may be imminent, police are working around the clock to try to deter another atrocity.

A German security official told the Post that Abedi was in Düsseldorf just four days before Monday's attack, on his way back to Britain from Turkey.

The bomber's father, Ramadan Abedi, and another sibling are now in the hands of authorities in Libya.

Authorities have detained a total of 11 people since the attack, but a 16-year-male and an adult woman were released without charges.

Asked whether the leaks from USA officials had compromised the ongoing investigation, Rudd said she "wouldn't go that far".

Ariana Grande said on Friday that she will return to Manchester for a benefit concert.

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