The bomber's name, Salman Abedi, was also leaked to the U.S. media against the wishes of the British authorities.
President Donald Trump said on Thursday that "deeply troubling" leaks to USA media about the Manchester suicide bombing would be investigated, after irate British police stopped sharing in-formation with United States agencies.
A German magazine reports that the Manchester concert bomber passed through Duesseldorf airport four days before the attack.
The New York Times published pictures which appeared to show parts of the bomb as well as torn fabric from the attacker's rucksack. Ramadan Abedi was interviewed from Libya while in detention, and he denied that his son was a follower of ISIS, who claimed responsibility for the attack on Tuesday.
Prime Minister Theresa May is expected to raise the issue of the leaks with President Donald Trump in Brussels later. The latest arrest took place in the Rusholme ward of Manchester on Friday and followed by a few hours the detention of another suspect in the inner-city Moss Side neighbourhood, Efe news reported.
"When the trust is breached it undermines these relationships, and undermines our investigations and the confidence of victims, witnesses and their family", the group said.
The two men, aged 20 and 22, were held on suspicion of terror offences after officers used an explosive device to gain entry to the property, Greater Manchester Police said.
Gallagher tweeted that he was "in total shock and absolutely devastated" by the attack.
In the note, Grande praised her fans for their response to the incident, which left 22 people dead and more than 60 injured, including young children and teens.
'These relationships enable us to collaborate and share privileged and sensitive information that allows us to defeat terrorism and protect the public at home and overseas.