Aslam covered the story of the controversial High Court case, which established the now 16-year-old girl's right to wear full-length Islamic dress to school.
Begum was encouraged and supported throughout her case by Hizb'ut Tahrir, to which Aslam has since revealed to have had links, including writing for its publication.
His article in the Guardian on March 3 was headlined 'I could scream with happiness. I've given hope and strength to Muslim women', although the report does not mention the role in the case played by the extremist Islamic group.
At the time, the story was seen as a political test case as Hizb'ut Tahir, of which one of Begum's brother's was also a member, pressed to allow Muslim girls to wear a style of Islamic dress that is only a step away from a full-blown burqa.
The Guardian issued a statement on Sunday saying that it planned to stand by its reporter, and keep the situation under review, despite his failing to reveal links to an extremist Islamic organisation, which is banned in many countries around the world.
The paper also pointed out that while Hizb'ut Tahir might be banned elsewhere, it operates legally in the UK alongside many other radical Islamic organisations, which has led to London being dubbed 'Londonistan' by commentators in the US and France.
Bloggers who have been following the story closely are still waiting for a response from the paper. One blogger writing on the political blog accuses the Guardian of being the mouthpiece for Hizb'ut Tahir and falling for crude political propaganda.
"It is now clear that the role of Dilpazier Aslam was Hizb'ut Tahir's propagandist. The Guardian was its mouthpiece. Hizb'ut Tahir has two faces. Internally, they are a racist theocratic and absolutist political organisation which uses fiery rhetoric to glorify terrorism and actively recruits to its fascist cause. Externally, when interviewed on Radio 4, they express themselves in the most anodine and uncontroversial terms and are usually unchallenged.
"This is precisely the technique used by Dilpazier Aslam and Hizb'ut Tahir in his exclusive interview with Shabina Begum in the case.
"This is extremist political propaganda of the crudest sort, and the Guardian fell for it. Is it any wonder that the grieving parents of suicide bombers from Yorkshire do not recognise the signs of political extremism when even liberal newspapers like the Guardian routinely normalise and peddle it? It is time that the Guardian took a hard look at itself."
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