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The brother of suicide bomber Salman Abedi who killed 22 people when he launched an attack at an Ariana Grande gig in Manchester has been arrested amid reports he was "planning a terror attack in the Libyan capital".

Hashem Abedi has been detained by police in Tripoli on suspicion of links with the Islamic State, Reuters reported.

Counter-terrorism forces said he was "planning a terrorist act" in Tripoli, according to the news agency.

A spokesman for the area’s local counter-terrorism force Rada, arrested the attacker’s brother, who was born in 1997, on Tuesday, spokesman Ahmed Bin Salem told reporters.

The arrest comes just hours after the pair’s father Ramadan Abedi told the Associated Press that another son Ismail had been arrested in the UK.

Salman Abedi detonated a device among a crowd of people as they left the 21,000 capacity venue on Monday.

Among those killed was eight-year-old Saffie-Rose Roussos, the youngest victim to be named so far.

Others included teenagers Olivia Campbell, Sorrell Leczkowski, Georgina Callander and Nell Jones.

Parents waiting to collect children from the gig also died in the blast.

Manchester Arena Terror Attack: Victims 16 show all Manchester Arena Terror Attack: Victims 1/16 Nell Jones, 14, who died in the Manchester attack PA 2/16 Jane Tweddle, 50 of Blackpool, was also killed 3/16 'Inseperable couple' Chloe Rutherford, 17, and Liam Curry, 19 4/16 Scottish teenager Eilidh MacLeod, 14, was confirmed to have been killed in the blast PA 5/16 Michelle Kiss died in the blast. Her family have said they are "absolutely devastated" PA 6/16 Saffie-Rose Roussos eight, from Lancashire, had been at the concert with her mother and sister when she was killed in the blast 7/16 Wendy Fawell died in the attack Collect 8/16 Olivia Campbell, 15, is also confirmed among the dead after a desperate search to find her 9/16 Ariana Grande ‘superfan’ Georgina Callander, 18, was one of the first victims to be named 10/16 Lisa Lees and Alison Howe were killed while waiting in the foyer to collect their children Facebook 11/16 Kelly Brewster died shielding her niece from the blast 12/16 John Atkinson, 26, was also killed in the suicide blast 13/16 Polish couple Angelika and Marcin Klis are confirmed among the dead in the Manchester attack Credit: Family photograph 14/16 Victim: Martyn Hett has been confirmed as one of those killed in the attack 15/16 Confirmed dead: 14-year-old Sorrell Leczowski Facebook 16/16 Victim: Elaine McIver, an off-duty police officer Greater Manchester Police 1/16 Nell Jones, 14, who died in the Manchester attack PA 2/16 Jane Tweddle, 50 of Blackpool, was also killed 3/16 'Inseperable couple' Chloe Rutherford, 17, and Liam Curry, 19 4/16 Scottish teenager Eilidh MacLeod, 14, was confirmed to have been killed in the blast PA 5/16 Michelle Kiss died in the blast. Her family have said they are "absolutely devastated" PA 6/16 Saffie-Rose Roussos eight, from Lancashire, had been at the concert with her mother and sister when she was killed in the blast 7/16 Wendy Fawell died in the attack Collect 8/16 Olivia Campbell, 15, is also confirmed among the dead after a desperate search to find her 9/16 Ariana Grande ‘superfan’ Georgina Callander, 18, was one of the first victims to be named 10/16 Lisa Lees and Alison Howe were killed while waiting in the foyer to collect their children Facebook 11/16 Kelly Brewster died shielding her niece from the blast 12/16 John Atkinson, 26, was also killed in the suicide blast 13/16 Polish couple Angelika and Marcin Klis are confirmed among the dead in the Manchester attack Credit: Family photograph 14/16 Victim: Martyn Hett has been confirmed as one of those killed in the attack 15/16 Confirmed dead: 14-year-old Sorrell Leczowski Facebook 16/16 Victim: Elaine McIver, an off-duty police officer Greater Manchester Police

Police confirmed on Tuesday that the 22-year-old was behind the atrocity.

However, Ramadan Abedi claimed his son was innocent and said he spoke to him five days ago and he sounded "normal".

He denied his Salman was even linked to militants or the suicide bombing.

He said that his son visited Libya a month and a half ago and was preparing to get ready to go to Saudi Arabia.

The elder Abedi told the Associated Press by telephone from the Libyan capital of Tripoli: "We don't believe in killing innocents. This is not us."

On Tuesday night Theresa May announced that the UK’s terror threat has been raised to critical, meaning another attack may be imminent.