The murderer has formally been identified by British police.
https://www.theguardian.com/uk-news/2017/may/23/manchester-arena-attacker-named-salman-abedi-suicide-attack-ariana-grande
Read the full thing guys.
Even before Abedi was named, several members of south Manchester’s Libyan community wondered whether the suicide bomber was one of their own: perhaps one of the young men who had fought in Libya during the 2011 revolution, some of whom came home traumatised and angry.
But none appear to have suspected that British-born Abedi – a slightly withdrawn, devout young man, always respectful to his elders – would become a mass murderer.
“Salman? I’m astonished by this,” one member of Manchester’s Libyan community told the Guardian. “He was such a quiet boy, always very respectful towards me. His brother Ismail is outgoing, but Salman was very quiet. He is such an unlikely person to have done this.”
Salman and his brother Ismail worshipped at Didsbury mosque, where their father, who is known as Abu Ismail within the community, is a well-known figure. “He used to do the five and call the adhan. He has an absolutely beautiful voice. And his boys learned the Qur’an by heart.
“Abu Ismail will be terribly distraught. He was always very confrontational with jihadi ideology, and this Isis thing isn’t even jihad, it’s criminality. The family will be devastated.”
Abu Ismail Abedi, who worked as an odd-job man in Manchester, is thought to be in Tripoli. His wife, Samia, is thought to be in Manchester. The couple are believed to have another son, Hashem, and a daughter, Jomana.
“Abu Ismail comes and goes between here and there,” the family friend said. “I can’t believe [Salman Abedi] would have been radicalised in Tripoli. All those types have been driven out of the city. It must have happened here.
“But what was he doing, murdering all those people. There must have been somebody influencing him. It’s terrible. He was off his head.”
Etc. It's quite in depth.