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On December 9th, the US Supreme Court dismissed a Pennsylvania Republican effort to discard mail-in votes, affirming Biden's win without dissent. Biden plans to appoint retired General Lloyd Austin as Defense Secretary, requiring a waiver due to his recent military service. Ethiopia denies calls for an independent probe into the Tigray conflict, amid reports of violence and displacement. Stay tuned for more global news updates.

What is the situation in the Tigray region of Ethiopia as mentioned in the text?

How many people have reportedly been displaced due to the violence in Tigray?