Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. US intelligence sources told news outlets in America that his family had informed on the 22-year-old as they feared he had become ‘dangerous’.Born and raised in Manchester in 1994, Abedi, the second youngest of four children, grew up in a Muslim household but matured into a university dropout with an appetite for bloodshed.His parents, mother Samia Tabbal and father Ramadan Abedi, a security officer, are Libyan-born refugees who fled to the UK to escape Gaddafi. It is thought they returned in 2011 following Gaddafi’s overthrow. The terrorist who killed 22 people at the Manchester Arena when he set off a bomb after an Ariana Grande concert spoke to his mother just before the vile attack, according to BBC Newsnight.A Libyan security source told the programme that the terrorist rang his brother in Libya, telling him to ask their mother Samia Tabbal to call him. It was also claimed that Tabbal, 50, graduated from Tripoli University top of her class.A close family friend told the Mail: “I am sure Salman’s mother and father are very shocked by what he did.”It is very sad because their mother is very intelligent. She told my wife that she was a nuclear science engineer and that she got excellent marks in her exams. She graduated top of her class from Tripoli University.” Abedi is thought to have an older brother Ismail Abedi, who was born in Westminster in 1993, a younger brother Hashim Abedi, and a sister Jomana, whose Facebook profile suggests she is from Tripoli and lives in Manchester. A family friend, who asked not to be named, said the family were known to the Libyan community in the city and described Abedi as “normal”.He told the Press Association: “He was always friendly, nothing to suggest (he was violent). He was normal, to be honest.”Abedi is believed to have attended the Manchester Islamic Centre, also known as the Didsbury Mosque.Sheikh Mohammad Saeed said he believed Abedi had displayed a “face of hate” after the imam gave a sermon denouncing terrorism.