TOKYO (Reuters) - Bitcoin's volatile week-long slide saw it tumble to below the $40,000 mark on Wednesday as news of further restrictions on cryptocurrency transactions in China added to earlier concerns sparked by Tesla boss Elon Musk's tweets.
Bitcoin, the world's biggest and best-known cryptocurrency, fell about 9% to as low as $38,940.04, even slipping below a key 200-day moving average. It is now down 40% from the year's high of $64,895.22 on April 14.
Ether, the coin linked to the ethereum blockchain network, dropped about 15% to $2,875.36.
The declines in the two most traded cryptocurrencies were sparked last week by Musk's reversal on Tesla taking bitcoin as payment, followed by other tweets that caused confusion over whether the carmaker had shed its holdings of the currency.
China's announcement on Tuesday that it is banning financial institutions and payment companies from providing services related to cryptocurrency transactions, coupled with a warning to investors against speculative crypto trading, seemed to have exacerbated the selling.
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