David Cameron is to announce moves tomorrow to stop young British Muslims being seduced by the bogus ‘glamour’ of Islamic State.

In a powerful speech, the Prime Minister will warn that ‘brutal and vicious’ IS wants to send young men to their deaths as ‘cannon fodder’, while women are raped and enslaved.

He will tell UK Muslim leaders they must do more to promote British values, and help to stop the growing number of youngsters who travel to Syria to join the terror group.

He will also unveil a range of measures to crack down on Islamic extremism in the UK.

No 10 refused to confirm details of the proposals, but The Mail on Sunday understands they could include:

Legal orders to close mosques where extremist meetings have taken place, while imams and other religious leaders in pastoral roles may be required to speak English;

New migrants arriving in the UK must promise to respect British values, while terror suspects could be denied asylum;

A review of sharia courts

A blacklist of extremist groups and individuals public bodies must boycott

Cuts in grants for translation services

A new law to prohibit hate preaching in public or online

Mr Cameron also hinted last night that Britain is ready to step up its military attacks on IS. In an interview with America’s NBC TV he said: ‘We’ve already carried out more airstrikes in Iraq than anyone else, other than the US. But I want us to step up and do what I call a full-spectrum response.

‘That means hammering IS in Iraq and helping with what the US is doing in Syria.’

Britain was already giving military support to Western allies in Syria but Mr Cameron added: ‘I want Britain to do more and we are talking about that now – but we must win support from our MPs.’

Significantly, the Prime Minister will make tomorrow’s speech in Birmingham, which has a large Muslim population. The city was at the centre of the Trojan Horse scandal, in which Islamist hardliners were said to have infiltrated schools. Some Muslims from Birmingham are among those who have travelled to Syria to join IS – which is also known as ISIL.

Mr Cameron will claim that Britain’s traditional beliefs in democracy, freedom and the rule of law are its biggest asset in the ‘battle against the twisted narrative of extremists’.

Cameron has also hinted last night that Britain is ready to step up military attacks on IS. He told American TV: 'I want Britain to do more and we are talking about that now - but we must win support from our MPs'

David Cameron will say that any strategy to defeat Islamic extremism must 'confront, head on, the extreme ideology that underpins it', adding: 'We should expose their extremism for what it is'

He will also issue a stark message to young British people tempted to join IS, saying: ‘We must deglamorise the extremist cause.

‘This isn’t a pioneering movement – it is vicious and brutal. My message to any young person here in Britain thinking of going out there is – you won’t be some valued member of a movement.

‘You are cannon fodder for them. If you are a boy, they will brainwash you, strap bombs to your body and blow you up.

‘If you are a girl, they will enslave and abuse you.

‘That is the sick and brutal reality of ISIL.’

Mr Cameron will add: ‘We must take apart its so-called glamour and contrast their bigotry, aggression and theocracy with our values.

‘We have a clear creed in our country and must promote it much more confidently. We are all British. We respect democracy and the rule of law.

‘We believe in freedom of speech, freedom of worship, equal rights regardless of race, sex, sexuality or faith.

‘We respect different faiths but expect those faiths to support the British way of life.’

Mr Cameron will say that any strategy to defeat Islamic extremism must ‘confront, head on, the extreme ideology that underpins it’.

‘We must take its component parts to pieces – the cultish worldview and conspiracy theories. In doing so, let’s not forget our strongest weapon – our own liberal values,’ he will add.