Judge says two brothers "equally culpable for the deaths and injuries" at the sentencing of Hashem Abedi, the younger brother of suicide bomber Salman.
Prosecutors had said his younger brother Hashem Abedi, now also 22, was just as guilty of the murders by helping his sibling to carry out the attack.
Authorities believe the younger brother of Salman Abedi, Hashem played a major role in planning the suicide bombing, the deadliest in a string of attacks in London and Manchester in 2017.
Prime Minister Theresa May and Prince William were among those attending a memorial service to remember the 22 victims of a suicide bombing at a pop concert in the city a year ago.
Salman Abedi, the Manchester attacker, travelled between the UK and Libya where he was under surveillance by local authorities. Yet Abedi easily returned to Britain, where he built and detonated a bomb.
Manchester bomber Salman Abedi grew up in neighbourhoods around south Manchester. Some in the area say poverty and under-funded social services are isolating young people and turning them against their communities.
The latest arrest was of a 23-year-old man in Sussex. Britain has lowered its security level from "critical" to "severe," meaning the country remains on high alert a week after the suicide attack killed 22 at a concert in the northern English city.
The statement by British interior minister came as UK police released new photographs of the suspected bomber.
It emerged that Istanbul was a mere transit stop for Salman Abedi before he flew to Europe. As this became known, Donald Trump promised to deal with security leaks that led to the bomber's name being leaked.
Several arrests have been made after the Daesh-claimed bombing at US pop star Ariana Grande's concert killed 22 and injured over 60 on Monday.
The UK has tightened its security following a bombing in Manchester, but people in the capital London try to continue with their daily lives as normal.
In the aftermath of the Manchester bombing which killed 22 and injured over 60, UK authorities make a series of arrests as they pursue a possible bombers network.
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