WASHINGTON (AP) — A Chinese student who became a vocal advocate for Tibet while living in Europe has been detained by Chinese authorities, according to two of her close friends, as Beijing is becoming more aggressive in its efforts to silence dissenting voices not only at home but also abroad.

State security officers from the central-southern Chinese city of Changsha detained Zhang Yadi, 22, on suspicion of "inciting separatism" after she traveled to her hometown this past summer to visit her family, her friends told The Associated Press.

In recent years, China has cracked down on protest and activism, especially when it relates to border regions like Tibet and Xinjiang that Beijing fears could seek independence. If Zhang is charged with inciting separatism and convicted, she could b

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