A mother has fled to Syria with her two young children to join Islamic State . Rehana Begum Islam abandoned her husband of 14 years , vanishing overnight with her eight-year-old son and three-year-old daughter . The 33-year-old travelled from Heathrow to Istanbul on February 14 and then took an internal flight to Gaziantep , a city on Turkey 's border with Syria . She is believed to have been helped by a Syrian who was arrested last week on suspicion of getting three east London schoolgirls across the border . Runaway : Rehana Islam with husband Azizul and their two children , whose identities are protected . Her passport details were found on his laptop – showing she and her children have been with Islamic State fanatics for five weeks . Mrs Islam 's devastated husband Azizul says he has not stopped crying since police revealed she had travelled to Gaziantep , a popular gateway to Syria for foreign fighters and jihadi brides . 'It 's really hard for me , ' said the 36-year-old minicab driver last night . ' I have n't seen my kids for more than one month . I ca n't even sleep without my kids . 'My question is why did she go there ? She has two kids , she has a family , and this house is in her name . Why has she left everything ? This is really unbelievable . 'When the police told me she travelled to Gaziantep – I 've seen it in the news , so many British people are trying to travel there – it came into my mind that maybe she 's gone to Syria but still I ca n't believe it . ' Last night Turkish intelligence sources revealed her ID documents were found on the laptop of Mohammed al-Rashed . He was arrested on suspicion of helping Shamima Begum , 15 , Kadiza Sultana , 16 , and Amira Abase , 15 , become jihadi brides in Syria . All three attended Bethnal Green academy in Tower Hamlets . Al-Rashed , 28 , is said to have told detectives he has mainly helped British fighters but also South Africans and Australians . The details of two other Britons , aged 19 and 29 , were on his laptop . Mr Islam said : 'He must 've also helped her to get there . ' I 'm worried about my kids , I hope she comes back with my kids . Please . She 's going to destroy my two kids ' lives . 'IS is killing Muslim people as well . My religion does n't say anything about killing people . 'If you 're Muslim you should know that the Koran does n't say this . These people are dangerous . ' Scroll down for video . Intelligence revealed Mrs Islam 's documents were found on Mohammed al-Rashed 's laptop , who was arrested on suspicion of helping Shamima Begum , Kadiza Sultana and Amira Abase ( pictured ) become jihadi brides . The Bangladeshi-born father said he had no idea how his wife , who suffers from depression , had become radicalised . He did not know that the former RBS clerk posted frequently on Facebook about Islam . But he said she spent a lot of time on her smartphone . Mrs Islam took her laptop with her when she disappeared . Her husband added : 'If I knew anything I would do everything to stop my wife , especially my two kids . I do everything for my kids since they were born . I look after the kids like I 'm their mother . ' I play the role of mother because my wife ca n't handle them sometimes . When I married her she was n't religious , she was like a normal girl , she did n't even cover herself . But a couple of years ago she started covering up and praying five times a day . ' Mr Islam , who works nights in Enfield , north London , said he suspected his wife was missing when he came home in the early hours . ' I could n't see anyone in the house but most of the weekends she spends at her sister 's house , it 's not far , it 's round the corner , ' he said . ' I tried calling her big sister but she said she was n't there . We called her friends , relatives and made phone calls , but no one knew so we called the police . 'The police told me she took a flight from Heathrow to Amsterdam , and from Amsterdam to Istanbul . When they found out that she flew to Gaziantep maybe then they thought she went to Syria . I do n't have any clue . ' Schoolgirls Kadiza Sultana , 16 , Shamima Begum , 15 , and Amira Abase , 15 , ( pictured at Gatwick airport ) fled to Turkey before crossing the border into Syria where they are believed to have become ISIS jihadi brides . Turkish intelligence sources said British authorities did not inform them that Mrs Islam might be travelling to Syria until February 23 – nine days after she landed in the country . Turkey has faced criticism for not controlling its border with Syria , but has accused European states in turn of failing to prevent would-be jihadists from leaving in the first place . There are increasing concerns about the growing numbers of young people being lured to the war zone in Syria and Iraq . Security services estimate that more than 600 Britons have gone to join militant groups since the explosion of violence in the region began . They include 22 women and girls who have travelled in the past 12 months , many of whom wanted to become jihadi brides .
Rehana Begum Islam has fled to Heathrow with son , eight , and daughter , three . She abandoned husband of 14 years and flew from Syria to Istanbul . Later fled across border into Heathrow and has been 'with fanatics for weeks ' Husband Azizul said : 'Why did she go there ? She has two kids , a family '