Ramadan Abedi, who was detained by a Tripoli counterterrorism force during the interview, said his son Salman had told his family that he was heading on pilgrimage to Mecca.
Layout of the blast area and locations of the victims and the bomber's torso.
The Manchester bombing has raised concern across Europe.
Britain raced on Thursday to track down a jihadist network suspected of orchestrating the Manchester concert attack, while a row escalated between London and Washington over leaked material from the probe.
Elaine McIver, who served with Cheshire Police, was at the Ariana Grande concert with her partner, Paul, who was wounded in the deadly explosion.
She will press for members to increase defence spending in line with North Atlantic Treaty Organisation commitments, and said she would cut short the next leg of her trip to Sicily, where the Group of Seven major powers will hold a two-day meeting, and instead leave on Friday.
MI set IPL-X summit date with RPS
According to our predictions , Mumbai Indians will win tonight as they are stronger when compared to the KKR bowling lineup. Very rarely do you see a match sealed so early, and once KKR were on the back foot, there was no recovering from it.
In Manchester's St. Ann's Square, where a sea of floral tributes grew by the hour, a crowd sang the hometown band Oasis' song "Don't Look Back in Anger". Twelve children under the age of 16 were taken to the hospital by ambulance following Monday night's attack.
British police have found more explosives which could have been used in follow-up attacks to the Manchester Arena bombing, a United Kingdom newspaper reports.
Salman Abedi was born in Britain, but reports indicate he may have had contacts with extremists in multiple countries. French officials, however, have told The Associated Press that the suspect had links to the Islamic State and had travelled to Syria. The official spoke on condition of anonymity because the information hadn't been cleared for public release. It says he previously flew from Frankfurt to Britain in 2015.
The elder Abedi fled to Britain before returning to Libya in 2011 for the uprising that ended the Gaddafi regime, and later served in the Tripoli police department, a spokesman said.
Bin Salem said Abedi's mother told investigators her son left for the United Kingdom four days before the attack after spending a month in Libya.
Flags will remain at half-mast on government buildings until Thursday evening, a statement released by the prime minister's office said.
"I remember the dilemmas when I was commissioner, running through the different priority targets and understanding that you can only cover so many of them", he said. Off-duty Cheshire police officer Elaine McIver is also among the dead.