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Trending PoliticsBREAKING: Ilhan Omar's sister has secretly vanished from her own book tour, and the timing could not be more suspect. With a federal subpoena reportedly in play and her sister nowhere to be seen since Monday's raid, the official explanation isn't going to cut it.Sahra Noor, Omar's older sister, had a scheduled book tour stop at the University of Minnesota Rochester at 6:30 p.m. Thursday, promoting her newly released memoir "Salt in the Snow: A Somali Immigrant Story." Garden Party Books, the University of Minnesota Bookstores, and the Rochester Public Library were all listed as proud supporters of the event.Fox News Digital had RSVP'd through the QR code on the flyer. They received no notice of a cancellation, reschedule, or relocation. When they arrived at the Intercultural Student Center, the space was completely empty.Garden Party Books told Fox News Digital the event was canceled due to a Noor "family emergency." Noor did not respond to a request for comment.Here's where it gets interesting.Noor came to the United States as a refugee alongside Omar and other family members in the 1990s, and she was reportedly subpoenaed in relation to the federal immigration investigation into her sister. She currently lives in Nairobi, Kenya, according to her LinkedIn page, but has been traveling on a worldwide book tour.Her sudden absence comes at a remarkable moment. Her sister is facing a federal probe related to potential immigration fraud, plus a separate investigation into her financial disclosures. And amid rumors that Omar herself fled the United States following the raid, the congresswoman has not been seen in public since Monday. Her husband snapped when asked outside their home on Wednesday whether he had a response to the rumors she fled the country.So the question now hanging over all of this: was Thursday night's "family emergency" really just a coincidence of timing?