The bodies of Britons killed in the Tunisia beach massacre are set to begin returning tomorrow, as it was confirmed the UK death toll is expected to reach 30.
Prime Minister David Cameron's official spokeswoman said 21 Britons had already been "positively identified" as victims of the murder spree, while another nine are believed to be among the dead.
Authorities in Tunisia are quizzing seven suspected associates of gunman Seifeddine Rezgui, a 23-year-old student who killed 38 people in the resort of Sousse on Friday.
In developments today:
:: All wounded Britons have been brought back to the UK, with four severely injured holidaymakers flown home in an RAF C17 transport plane accompanied by "medevac" teams. They are being treated at hospitals in Birmingham, Oxford, Plymouth and London
:: Possible connections between the gunman and extremism in the UK emerged, while there were reports that the killer was an Islamic State "sleeper" who was trained in Libya
:: The family of a Scottish couple who were unaccounted for said they are dead
:: A major exercise to test the preparation of the emergency services for a gun attack was carried out in London
The Government is "working closely" with the families of those killed in Sousse, and has offered to arrange for the bodies of their loved ones to be flown by RAF plane to Brize Norton in Oxfordshire before being transported on to their home areas, Downing Street said.
The repatriation process is expected to take a number of days.
Mr Cameron addressed senior ministers at Cabinet about the UK's response to Friday's atrocity and Foreign Secretary Philip Hammond was this afternoon chairing a meeting of the Government's Cobra emergency committee.
A joint inquest covering all the British victims is to be opened by the West London coroner.
Mr Cameron has announced that a minute's silence will be held in memory of the victims at noon on Friday, a week after the outrage. Downing Street said flags will be flown at half-mast over Whitehall departments that day.
The Prime Minister spoke yesterday with Tunisia's ambassador in London about what assistance Britain can give the north African country to improve security and strengthen its democratic system.
The gunman was linked to Saifallah Ben Hassine, a fanatic who was based in London for at least three years and a disciple of the cleric Abu Qatada, the Daily Mail reported today.
Claims have also emerged that Rezgui was part of a five-man terror cell which has been in existence for four years. A fellow student told Sky News that he "loved everything they (IS) stood for".
Authorities in Tunisia have issued images of two suspected accomplices they are hunting.
They have said Rezgui acted alone during the rampage but had accomplices who supported him before, providing him with weapons and logistical support. Some 80 unregulated mosques believed to preach radical doctrines have been closed.
Tunisian president Beji Caid Essebsi said an investigation was under way into security failures and there would be armed tourist police on beaches.
The president said heightened security had been planned from July 1 to coincide with the Muslim holy month of Ramadan, but that attacks on sunbathing tourists had not been anticipated.
Mr Essebsi told Europe 1 radio: "It is not a perfect system - it is true we were surprised by this affair. They took measures for the month of Ramadan but never did they think the attack would be on the beaches against tourists, and the system of protection was set to start July 1."
A relative of Billy and Lisa Graham, from Bankfoot, near Perth, who had not been heard of since the attack, said they had died.
The couple were staying in one of the hotels where the terrorist attack happened.
The Daily Record reported that Mr Graham's older brother Lindsay contacted them with the news that the couple had died.
Police, soldiers, emergency services and intelligence officials are taking part in London's largest counter-terrorism exercise.
The operation, planned before the Tunisia attack, is testing the response to a mass firearms attack in the capital.
Tomorrow a key strand of the Government's strategy to counter extremism will come into force. New legislation passed earlier this year places a statutory duty on bodies including prisons, schools and universities to prevent radicalisation.
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