The Prime Minister has tweeted ahead of a day of remembrance a decade after the London July 7th bombings.
David Cameron tweeted to say that: "the threat continues to be as real as it is deadly – but we will never be cowed by terrorism."
At 11.30am today, the country comes together to remember the victims of one of the deadliest terrorist atrocities on mainland Britain.
Ten years on from the 7/7 London attacks, the threat continues to be as real as it is deadly – but we will never be cowed by terrorism.
David Cameron has confirmed he will be "joining millions" in remembering the victims of the Tunisia beach atrocity in a minute's silence later today.
At midday I'll be joining millions stopping for a minute to remember the people murdered in Tunisia last week.
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The Prime Minister has tweeted to say how moved he was as eight of the Britons killed in the Tunisia attack last Friday are brought home.
It is deeply moving to see the bodies of people killed in Tunisia being brought back home.
David Cameron has said the West must stop "the poisoning of young minds" by Islamic State and other extremists.
The Prime Minister said he had spoken to Francois Hollande to offer his support after the attack near Lyon and would also speak to the Tunisian government following the attack there to offer "our solidarity in fighting this evil of terrorism".
"This is a threat that faces all of us," Cameron said. "These events have taken place today in Tunisia and in France but they can happen anywhere. We all face this threat."
"The people who do these things, they sometimes claim they do it in the name of Islam. They don't. Islam is a religion of peace," he said.
"They do it in the name of a twisted and perverted ideology that we have to confront with everything that we have."
David Cameron had been due to talk with French President Francois Hollande about the situation in Calais this morning.
ITV News Deputy Political Editor Chris Ship reports:
David Cameron has spoken to French President Francois Hollande to convey his sympathies "over what appears to be an appalling incident", Downing Street said.
"Details are still emerging, so we wait to see those," the spokesman continued. "But it clearly looks an extremely concerning situation and our thoughts are with all those affected by it."
David Cameron has defended the Government's plans to cut a further £12 billion from the welfare bill, saying he was determined to transform Britain into "a higher wage, lower tax, lower welfare society".
Mr Cameron said Britain needed to end the "merry-go-round" where people on low pay paid tax to the Government only for the Government to hand back the money in welfare payments.
"We need to move from a low wage, high tax, high welfare society to a higher wage, lower tax, lower welfare society," the Prime Minister said in a speech in Runcorn in Cheshire.
Mr Cameron's comments come amid speculation ministers are preparing cuts to tax credits in his first all-Conservative Budget next month.
Andy Burnham, the Labour leadership candidate, has said it is "disgraceful" that ministers had yet to outline where the cuts would come.
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