* Indexes down: Dow 1.90%, S&P 500 2.71%, Nasdaq 3.56% * S&P 500, Nasdaq see biggest one-day pct drop since April 10 * Indexes erase weekly gains * U.S.-listed shares of Chinese firms tumble (Updates with closing prices) By Stephen Culp NEW YORK, Oct 10 (Reuters) – Wall Street tanked on Friday after U.S. President Donald Trump rattled markets by unleashing a string of bellicose threats against China after Beijing tightened its rare earth restrictions. In a post on Truth Social, Trump said he is weighing a "massive" tariff increase on Chinese imports and said there is no reason to meet with China's President Xi Jinping in two weeks as planned, adding that there are "many other countermeasures" under consideration. The tirade shocked markets and threatened further damage to already strained

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