According to Reuters, British police have stopped sharing information about the suicide bombing, which took place at an Ariana Grande concert, with USA officials after police said leaks to the media "risked hindering their investigation".
British Prime Minister Theresa May on Thursday said progress was being made in the investigation, but that "the public should remain vigilant".
Authorities are slowly uncovering more details of Abedi and the days before the attack was carried out.
Police officers stand on duty outside a residential property on Elsmore Road in Fallowfield, Manchester, thought to be the home of Salman Abedi..
The name of the alleged bomber, Salman Abedi, was also published in US news outlets before it was officially announced by United Kingdom authorities.
British Prime Minister Theresa May planned to raise the issue with Trump during a North Atlantic Treaty Organisation meeting Thursday in Brussels. "This damage is even greater when it involves unauthorized disclosure of potential evidence in the middle of a major counter terrorism investigation". USA and Israeli officials have not confirmed nor denied the source of the information.
The bomber's name was allegedly released by US officials just as raids were underway both in Manchester and in Libya where the bomber's father lives.More news: NASA's Juno Mission Reveals New Discoveries About Planet — Jupiter Photos
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British officials, who have also had access to sensitive information regarding past USA -focused investigations, are bound by the Official Secrets Act.
Manchester police said the eight arrests were "significant" to the investigation that is expected to include raids and searches for the next several days.
Another sibling, 18-year-old brother Hashim, and Abedi's father were arrested in Tripoli on Wednesday.
Abedi died in Monday's blast at an Ariana Grande concert.
The UK on Thursday held a one-minute silence at 11 a.m. local time in tribute to the attack's victims and their families.
Ballons and flowers are seen in Albert Square in central Manchester, northwest England on Wednesday..
At least 23 people remain critically injured following the blast, and 116 people received treatment at Manchester hospitals for their injuries. The National Health Service says 75 people have been admitted to eight hospitals, "including 23 patients now receiving critical care".