The Home Secretary has said comments by Ukip leader Nigel Farage about the Charlie Hebdo attack in Paris were "irresponsible."
Mr Farage said the attack was the result of "having a fifth column" living in Western countries opposed to their ideals.
He told Channel 4 News:
There is a very strong argument that says that what happened in Paris today is a result - and we've seen it in London too - is a result I'm afraid of now having a fifth column living within these countries.
We've got people living in these countries, holding our passports, who hate us.
Luckily their numbers are very, very small but it does make one question the whole really gross attempt at encouraged division within society that we have had in the past few decades in the name of multiculturalism.
Theresa May said it was "irresponsible to talk about a fifth column."
When asked about Ukip leader's comments, David Cameron said: "Today is not the day to make political remarks or arguments.
"Today is the day to stand four-square behind the French people."
Dozens of survivors of alleged child abuse have welcomed moves by the Home Secretary which could see the panel investigating the claims disbanded and a more powerful body put in its place.
Theresa May wrote to the panel's members setting out her plan for the inquiry to be given statutory powers, including the ability to compel witnesses to give evidence.
The move has left members of the panel "devastated" that they could face being removed from the inquiry, but more than 60 victims and their representatives have backed a proposal which could see the investigation start again from scratch.
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Liberal Democrat MP Norman Baker has stepped down from his role as Home Office minister to spend more time on his band, his family and his constituents.
His fractious relationship with Home Secretary Theresa May also played a large part in his decision.
ITV News Political Editor Tom Bradby reports:
The incoming Home Office minister Lynne Featherstone has said she is happy with her appointment as Norman Baker's replacement and is looking forward to resuming her work on women's rights, including bringing an end to female genital mutilation.
I am very happy to be returning to the Home Office. I am very proud of what I was able to achieve in my previous role there, not least introducing equal marriage, ending the fingerprinting of children and banning wheel clamping on private land.
I am also looking forward to continuing my work tackling violence against women and girls and on ending FGM at home and abroad.
I have always had a very constructive relationship with Theresa May and I look forward to working with her again.
Lynne Featherstone is to replace Norman Baker as Liberal Democrat minister at the Home Office, Nick Clegg has announced.
The MP for Hornsey and Wood Green was appointed Home Office junior minister for equality in 2012. Two years later she became junior minister for international development.
She has also been Lib Dem spokesman for youth equality and was one of the first politicians to push the same-sex marriage bill through parliament.
Liberal Democrat MP Norman Baker, who has resigned as Home Office minister, says dealing with Home Secretary Theresa May was a "constant battle" and relations in the department were "disappointing".
Mr Baker denied claims that he thought he was the same ministerial rank as Mrs May but accused her of treating the department as if it was part of a Conservative government and not a coalition.
He added that he needed a break from ministerial office to spend more time with his family and on outside interests.
Former Tory minister Damien Green has described Norman Baker as a "natural lone wolf, not a natural team player".
He said Baker did not like the fact he had to work under Home Secretary Theresa May and wanted to clear everything himself.
"I think he maybe he had unrealistic expectations of what his job was", Green added.