Nick Clegg has delivered a message to Islamic State, telling the organisation what they are doing is "sick and twisted" and they "will not win".
The Deputy Prime Minister said: "If you're doing this to intimidate us, you won't. If you're doing this to break our resolve, you won't. If you're doing this to drag us into a religious war on your terms, you won't."
Instead Britain will "play our role to hunt you down and to rid the world of this barbaric violence," he added.
Nick Clegg has condemned the "brutal murder" of British hostage Alan Henning "by an organisation that is twisting ... religion to its own ends."
The Deputy Prime Minister said his "heart goes out" to Mr Henning's family.
"He was obviously a good man trying to do good things," the Lib Dem leader said.
"He was trying to help people in Syria, he was trying to help the many Muslims who are suffering in Syria and he's now been brutally murdered by an organisation that is twisting that religion to it's own ends."
Deputy Prime Minister Nick Clegg has condemned the "barbaric actions" of Islamic State after the murder of Alan Henning, adding that the government is "resolved to defeat this evil".
Sincere condolences to Alan Henning's family. Barbaric actions of ISIL are held in complete contempt. We are resolved to defeat this evil.
Alan Henning was a man moved to selflessly help those most in need and we should remember that above all else at this difficult time.
Deputy Prime Minister Nick Clegg had the last word at the end of a six-hour debate in the House of Commons regarding air strikes in Iraq:
We must act. We do so mindful of the mistakes and lessons of the past, but we do so with lawful authority, with clear objectives and with the support of active participation of a broad coalition of international opinion which is saying to ISIL 'enough is enough'. And that is why, Mr Speaker, I commend this motion to the House.
Deputy Prime Minister Nick Clegg has tweeted:
It's right that parliament is recalled for MPs to debate UK response to Iraqi Gov request for support in fight against ISIL
Communities and Local Government Secretary Eric Pickles has cautioned against calls for the creation of powerful new combined local authorities centring on big cities, after Nick Clegg called for more devolution of powers.
Localism in England should be about devolving power to the lowest appropriate level - down to councils, to neighbourhoods and to individuals.
There may be some role for combined authorities on a strategic level to promote economic development and transport, but there is a real risk they will suck power upwards away from local councils and local taxpayers.
The time has come to push for action on decentralisation in England, Nick Clegg is to say, as part of a new report calling for a new wave of "metro mayors" for city regions with greater powers to vary taxes to local councils.
In his speech, the Liberal Democrat leader will say:
You only need look at how the Scottish referendum debate has re-energised people's interest and engagement in politics over the last few weeks to see that this is an idea whose time has come.
Over the last decades, we've seen a wave of new powers shifting out to every nation of the UK, except England.
With a new consensus now emerging amongst the UK's three main political parties to extend devolution and decentralisation in the future, I believe we can push forward in realising our ambitions for a stronger, fairer Britain.
The independence debate in Scotland has underlined the need for greater decentralisation of power within England, Nick Clegg will say today.
The Deputy Prime Minister will say that an emerging consensus among the three main political parties meant there was a real opportunity to devolve power to the English regions.
Mr Clegg is launching a report by the IPPR North think-tank, calling for a new wave of "metro mayors" for city regions with greater powers to vary taxes to local councils.
The Deputy Prime Minister has spoken about the "momentous decision" facing Scots next week. Nick Clegg said the differences between Scotland and England should be celebrated without the links between the two countries being destroyed.
He warned about the "huge risks and uncertainties" of Scottish independence, but promised further powers for Scotland if the No campaign is successful.