The British death toll in the Tunisia hotel attack on Friday is set to rise above 30, BBC News reported.
The UK prime minister David Cameron has said that Britain is "united in shock and grief”.
A total of 38 people were killed by a gunman with links to ISIS on a beach near Sousse, and inside the Hotel Riu Imperial Marhaba.
Writing in the Daily Telegraph, David Cameron urged a fightback, vowing the UK would show "unshakeable resolve" in dealing with extremism.
He stressed the need to reject those who condone the "extremist narrative".
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Tributes are continuing to be paid to the British victims, who include three generations of the same family, university graduates and a husband who died trying to shield his wife.
A number of British tourists remain missing, with their relatives continuing to wait for news.
None of the dead have been officially identified but the names of some were confirmed by friends and family.
These include Carly Lovett, 24; Sue Davey and her partner Scott Chalkley, both in their 40s; Adrian Evans, his father, 78-year-old Patrick Evans and nephew Joel Richards, 19. Joel's brother Owen, 16, survived the attack.
Bruce Wilkinson, 72; Lisa Burbidge, in her 60s; Claire Windass, 54, from Hull, who had been on the beach with her husband, who survived; Jim and Ann McQuire, from Scotland; Trudy Jones, 52, and Stephen Mellor, 59 were also killed in the attack.
Along with the Brits, three Irish people were killed, as well as one Belgian and one German.
Tunisians are also thought to be among the dead.
At least 36 people were injured.
BBC News has reported that the number of British victims - which currently stands at 15 - will rise to at least 30 once the formal identification process is complete.
But it is also understood the process is taking time because of stringent Tunisian regulations, including the local coroner's requirement for medical or dental records.
The UK government also suggested officials were having difficulty identifying British victims as many were not carrying identification and because the injured were being moved between hospitals.
Writing in the Telegraph, David Cameron said that as the identities of the dead continued to emerge the full "horror" of events was becoming clear.
"But we will not be cowed," he said. "To our shock and grief we must add another word: resolve. Unshakeable resolve. We will stand up for our way of life.
"So ours must be a full-spectrum response - a response at home and abroad; in the immediate aftermath and far into the future."
He said ISIS used social media as its "primary weapon" and police and security services must have "the tools they need to root out this poison".
Mr Cameron - who will chair another meeting of the Cobra emergency committee on Monday morning - said it was also vital to confront the "poisonous ideology" behind attacks like that carried out in Tunisia.
"We must be stronger at standing up for our values - of peace, democracy, tolerance, freedom," he said.
The Tunisian authorities have said they believe the gunman, 23-year-old Seifeddine Rezgui, had help in carrying out the attack.
They believe the suspected accomplices provided the Kalashnikov assault rifle to Rezgui and helped him get to the scene, interior ministry spokesman Mohamed Ali Aroui told AP.
He said the attacker's father and three friends he lived with in Kairouan, where he studied, had been detained for questioning.
(As reported by BBC News)
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