Yassmin Abdel-Magied, the award winning author and one\u00a0Australia\u2019s leading female Muslim activists, was\u00a0barred\u00a0from entering the US immediately after she landed\u00a0in the country.\r\nThe 27-year-old\u00a0was set to speak at the PEN\u00a0World Voices Festival in New York next week.\r\nBut after touching down in\u00a0Minneapolis on Wednesday afternoon,\u00a0the author who is a fierce critic of Australia's immigration policies, said she was detained by border agents.\r\n\u201cI\u2019m currently at the border and they\u2019ve said I\u2019m being deported," the\u00a0Australian-Sudanese author tweeted. "This should be fun. What are my rights?\r\n"Interesting facts: within a few min of looking at my case the border security person - Officer Herberg looking at my case she announces: \u2018we\u2019re sending you back!\u2019\u201d\r\nUS authorities said\u00a0Ms Abdel-Magied was denied entry because they determined she was being paid to speak at the conference which is a violation of her visitor\u2019s visa.\r\nThe activist, who live-tweeted her fleeting stay on American land, claims the agents informed her they had cancelled her visa and required her to return to London where she currently resides.\r\n"They've taken my phone, cancelled my visa and are deporting me. Will follow up on messages once I understand what's going on,\u201d she said.\r\nMs Abdel-Magied\u00a0was scheduled to speak on a panel at the festival titled \u201cThe M Word: No Country for Young Muslim women\u201d.\u00a0\r\nThree hours after touching down in Minneapolis she found herself on a plane heading home.\u00a0\r\n"Well, guess that tightening of immigration laws business is working, despite my Australian passport. We're taking off now. What a time," she tweeted.\r\nShe claimed authorities still had her passport when she boarded the aeroplane back home.\u00a0\r\n"Apparently I can't be trusted with it until I'm in a foreign country because, as Officer Blees said, 'planes get turned away back way too often'," she wrote.\u00a0\r\nShe added: "Oh\u00a0yuh\u00a0and did I mention they took my phone for the whole time? Fortunately, I\u2019m a paranoid person - notifications don\u2019t show previews of messages and a 12 digit passcode. Always be vigilant, yo."\r\nA spokesperson from the US Customs and Border Patrol (CBP) said:\u00a0\u201cDuring the inspection, CBP officers determined this individual did not possess the appropriate visa to receive monetary compensation for the speaking engagements she had planned during her visit to the United States.\u201d\r\nMs Abdel-Magied, who was born in Sudan, received a wide-reaching backlash after writing a\u00a0Facebook\u00a0post on Anzac Day, a national day of remembrance for members of\u00a0Australia and New Zealand's armed forces, which suggested that her countrymen should\u00a0remember the suffering\u00a0in\u00a0Syria and Palestine. She also highlighted\u00a0the plight of\u00a0refugees on Papua New Guinea's Manus Island and Nauru where\u00a0Australia holds asylum seekers in refugee processing centres.\u00a0\r\nPoliticians and other critics accused her of politicising the day and she later removed the post.\r\n"It was brought to my attention that my last post was disrespectful and for that, I apologise unreservedly,\u201d she wrote at the time.\r\nThe writer subsequently moved to London. She said she felt betrayed by Australia and branded herself the country's "most publicly hated Muslim."\r\nMs\u00a0Abdel-Magied, who trained as\u00a0a mechanical engineer, founded the Youth Without Borders\u00a0organisation.\u00a0\u00a0In 2007 she was named young Australian Muslim of the year.\u00a0\r\nPEN America CEO Suzanne Nossel said she was "dismayed" that\u00a0her guest had been refused entry and would no longer be able to speak at the festival.\u00a0\r\nShe said Ms\u00a0Abdel-Magied was "an advocate of the rights of Muslim women and refugees and is a citizen of Australia, travelling on that country\u2019s passport."\r\nShe added: "The very purpose of the PEN World Voices Festival, founded after 9\/11 to sustain the connectedness between the US and the wider world, is in jeopardy at a time when efforts at visa bans and tightened immigration restrictions threaten to choke off vital channels of dialogue that are protected under the First Amendment right to receive and impart information through in-person cultural exchange," she added.\r\n"We call on Customs and Border Patrol to admit her to the US\u00a0so that she can take her rightful place in the urgent international conversation to take place at the Festival next week"