The brother of the alleged Manchester bomber had links to the Islamic State group and was aware of his brother’s plans, a Libyan security force said.
The Special Deterrent anti-terror force said in a statement on its Facebook page that the arrest of Hashim Abedi took place in Tripoli as he was receiving cash transferred from his brother Salman.
British authorities have identified 22-year-old Salman Abedi as the suspected bomber in the attack at Manchester Arena on Monday night.
The force’s statement says: “The brother was aware of all the details of the terrorist attack.”
The Libyan security force claimed that Hashim Abedi told authorities that both he and his brother belonged to IS.
The Facebook statement says Hashim left Britain for Libya in April.
Meanwhile, the father of the alleged Manchester arena attacker has denied that his son is linked to militants or the suicide bombing that killed 22 people.
Ramadan Abedi said he spoke to his 22-year-old son Salman Abedi five days ago and he was getting ready to visit Saudi Arabia and sounded “normal”.
He said that his son visited Libya a month and a half ago.
The elder Abedi told The Associated Press by telephone from Tripoli: “We don’t believe in killing innocents. This is not us.”
He said his other son, Ismail, was arrested in England on Tuesday morning.
He said Salman was planning to head from Saudi Arabia to Libya to spend the holy month of Ramadan with family.
Mr Abedi fled Tripoli in 1993 after Muammar Gaddafi’s security authorities issued an arrest warrant and eventually sought political asylum in Britain.
Now, he is the administrative manager of the Central Security force in Tripoli.