text: A woman who managed to escape the clutches of Islamic State has revealed how people are living in fear and suffering under the terror organisation. The woman, who did not want to be identified, told a BBC documentary that airs tonight that she has seen people killed in front of her for breaking the rules enforced by IS. She was lucky to escape from the IS capital Raqqa in Syria where she said women are forced to cover up in a burka and must not go out in public alone. A woman who has fled from Raqqa in Syria said women are forced to cover up (pictured posed by model) A picture taken in the IS capital Raqqa in Syria shows women walking in burkas, they could be whipped for refusing to wear one when they go out . She said: 'IS has stripped women of all their freedom, they said we must cover the whole face, this is all forced on us by IS, nothing at all of a woman is revealed.' She added that women are banned from doing most jobs as their role must be in the home as a wife and mother. They are not allowed to travel without a man accompanying them - and any infringements can result in severe punishment by the religious police. She said: 'Sometimes people get whipped. After that many people began to fear IS.' She explained that it is this fear that is making people join the group. The refugee said fear of IS is making many join them: 'Better to take the things they offer than die of hunger' 'If you are a member of IS they give you gas, petrol and bread,' she said. 'Unfortunately there are a lot of simple-minded people who say "yes, I'll join them". Better to take the things they offer than die of hunger, this is how they force people to support them.' In just one example of how the group violently control both men and women, she revealed the terrible punishment inflicted on those who break the rule of not smoking. 'If a man is caught smoking they will heat up a metal skewer and put it in his mouth,' she said. Of everything she has been through, the female refugee said: 'the worst feeling is to witness other people killed in front of you.' The IS tactics have been decribed as taking a 'Ghengis Khan and the mongol approach to military conquest' Sadly, this is common if people fail to stick to the rules defined by IS, who want to establish a Islamic utopia by any means necessary. Alastair Crooke, director Conflicts Forum, explains on the BBC documentary how the terrorist group are taking the 'Ghengis Khan and the mongol approach to military conquest'. He said: 'You create an absolute fear in your enemies and the first time you come to a village you kill everything... the dogs, the cats, destroy it down to the ground.' Families pictured fleeing from on going fighting between Islamic State militants and Iraqi security forces . Peter Taylor interviews Hussam al-Ahmed, a Syrian photographer, in a special documentary investigating the rise of IS and their diverse sources of funding . As ruthless bands of bloodthirsty fighters take over villages, women and children are murdered or sold into slavery. In BBC Two's one hour special documentary, Peter Taylor reveals how the group have risen to power thanks to a diverse source of funds including oil, ransoms, extortion and theft.  They have amassed a war chest of an estimated $2billion. The programme features the first ever TV interview with IS leader Abu Hajjar and investigates what's made it the World’s Richest Terror Army. This World: World's Richest Terror Army is on BBC2 at 9pm .
target: Woman who escaped IS capital Raqqa in Syria shares her story .
  She has seen people killed in front of her for breaking IS rules .
  Women will be whipped if they refuse to cover up in public .
  Hot metal skewer put in mouths of those caught smoking .
  'IS has stripped women of all their freedom,' she said .