Greater Manchester Police says it is "confident" it knows the identity of all the people who died in the Manchester Arena suicide bombing.
The force has said it has made contact with all of the families affected and that it could take "four to five days" before some victims are formally named.
22 people died following the attack after Monday night's Ariana Grande concert.
PR manager Martyn Hett is the latest person to be named as a victim.
Mr Hett, from Stockport, is believed to have been at Monday's Ariana Grande concert with his friend Stuart Aspinall when the pair became separated.
His friend Russell Hayward said on Twitter: "We got the news last night that our wonderful iconic and beautiful Martyn didn't survive.
"He left this world exactly how he lived, centre of attention."
The youngest person known to have died is eight-year-old Saffie Roussos, who was at the concert with her mother.
A Greater Manchester Police statement read: "We are now confident that we know who all the people are, who have sadly lost their lives in the attack at the Manchester Arena.
"We have made contact with all of the families and our specially trained officers are supporting them.
"Due to the number of victims, forensic post-mortems are likely to take four to five days. After this we will be in a position to formally name the victims with guidance from the coroner."
Fears are growing for South Shields couple Chloe Rutherford, 17, and Liam Curry, 19, following the attack.
Mr Curry, a former pupil of Gateshead College, is studying for a degree in sport and exercise science at Northumbria University.
Bernard Wills, 36, the cousin of Mr Curry's father, said: "They are a great young couple, really loving, with a bright future ahead and there's nobody that doesn't like them."