The bodies of nine British victims of the Tunisian beach massacre were this afternoon being flown home, as the final UK death toll was confirmed at 30.
The Foreign Office said an RAF C17 transport plane was returning the remains of Lisa and William Graham, Philip Heathcote, Trudy Jones, Ann and James McQuire, Janet and John Stocker, and David Thompson to Brize Norton air base in Oxfordshire.
Eight Britons killed in the terror attack were brought back to British soil yesterday, and further flights are expected tomorrow and on Saturday.
British nationals made up the majority of the 38 killed by gunman Seifeddine Rezgui when he opened fire on holidaymakers on a beach in the resort of Sousse on Friday - along with three Irish nationals, two Germans, one Belgian, one Portuguese and one Russian.
Foreign Secretary Philip Hammond said: "We now have all 30 British victims positively identified and we can say with a high degree of confidence that is now the final death toll of British nationals killed in this incident."
As the hunt continued for accomplices believed to have helped Rezgui carry out the atrocity, the Tunisian government said it had arrested 12 suspects.
According to Tunisian officials, the gunman trained at a Libyan jihadist camp at the same time as the two gunmen who attacked the Bardo museum in Tunis in March, killing 22 people.
Defence Secretary Michael Fallon vowed that those responsible for the massacre would be "tracked down".
Mr Fallon told the House of Commons: "We are working with the Tunisian authorities to find out exactly how this outrage last Friday was carried out, how it was planned, who was involved in it.
"Let the House be in absolutely no doubt, the people who perpetrated the murders of our constituents are going to be tracked down, whether they are in Libya, in Syria or anywhere else."
Relatives of Rezgui's victims are expected to gather at RAF Brize Norton to watch their coffins arrive and be transferred to hearses, which will transport them to west London, where a coroner is preparing a single inquest for all UK fatalities.
They were being joined at the airbase by Scottish Deputy First Minister John Swinney and Home Office minister James Brokenshire.
Mr McQuire, 67, and his wife, 64, were from Cumbernauld in North Lanarkshire, where vicar Joyce Keyes described them as a "kind and gentle couple". Mr and Mrs Graham from Bankfoot, near Perth, were visiting Tunisia to celebrate Mrs Graham's 50th birthday.
Mr Heathcote, 52, from Felixstowe, Suffolk, was celebrating his 30th wedding anniversary with wife Allison, 48, who was seriously injured in the attack and has been flown back to Britain by the RAF for treatment.
Ms Jones, of Blackwood in Gwent, south Wales, was described by her family as "our beautiful mother". She was a 51-year-old divorced single mother-of-four and had been on holiday with her friends.
Mr Stocker, 74, was a retired printer, born and bred in Peckham, south-east London, and was a father of five children and had 10 grandchildren, while Mrs Stocker, 63, was born and raised with her two brothers in Fulham, south-west London.
Mr Thompson, 80, from Tadley, Hampshire, was a retired scientist at the Atomic Weapons Establishment.
Wounded Britons - including four with severe injuries - have already been brought back to the UK for treatment at hospitals in Birmingham, Oxford, Plymouth and London.
A minute's silence in memory of the victims will be observed at noon tomorrow - a week after the outrage - and flags will be flown at half-mast over Whitehall departments and Buckingham Palace. Whitehall officials were meeting this afternoon to consider the continuing UK response to the attack.
Those repatriated yesterday included the youngest known victim, Joel Richards, 19, with his uncle Adrian Evans and his grandfather Patrick Evans; fashion blogger Carly Lovett, 24, from Gainsborough, Lincolnshire; Stephen Mellor, 59, from Bodmin in Cornwall; John Stollery, 58, a social worker from Nottinghamshire; former Birmingham City football player Denis Thwaites, 70, and his wife Elaine, 69.
The other British victims include: John Welch, 74, and his partner Eileen Swannack, from Wiltshire; Christopher and Sharon Bell, from Leeds; Chris Dyer, from Watford; Lisa Burbidge, from Gateshead; Sue Davey from Staffordshire; Scott Chalkley from Derby; Claire Windass from Hull; Bruce Wilkinson, 72, from Goole, East Yorkshire; and Stuart Cullen, 52, from Suffolk.
The Irish victims were Lorna Carty, from Robinstown, Co Meath, and Laurence and Martina Hayes, both in their 50s, from Athlone in Co Westmeath.