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UPDATE 5-Bitcoin skids after China clamps down on mining, trading activities

* China reiterates bitcoin crackdown

* China state broadcaster warns of systemic risks in crypto

* Bitcoin down 42% from record high hit in April

* Ether down 45% from all-time peak touched earlier this month (Adds new comment, details, updates prices)

NEW YORK/LONDON, May 21 (Reuters) - Bitcoin slid on Friday after China doubled down on its efforts to prevent speculative and financial risks by cracking down on the mining and trading of the world’s largest and most popular cryptocurrency.

China’s Financial Stability and Development Committee, chaired by Vice Premier Liu He singled out bitcoin as the asset it needs to regulate more.

China has banned crypto exchanges and initial coin offerings before but has not barred individuals from holding cryptocurrencies.

Bitcoin last traded down 8% at $37,520, after holding the $40,000-level for most of the Asian and London sessions. The current price was roughly 25% above its Wednesday low, but below its 200-day moving average.

Since hitting an all-time high of just under $65,000 in mid-April, bitcoin has fallen about 42%. It’s down 24% so far this week.

The statement, which came days after three Chinese industry bodies tightened a ban on banks and payment companies providing crypto-related services, was a sharp escalation of the country’s push to stamp out speculation and fraud in virtual currencies.

Liu is the most senior Chinese official to publicly order a crackdown on bitcoin. This is the first time the government has explicitly targeted crypto mining.

“It’s hard to read into the real impact of potential action by China, as these statements are being made without specifics,” said John Wu, president of Ava Labs, an open-source platform for financial applications.

“That said, this statement does show the clear risk for bitcoin mining being so reliant on China, and the wills of its government.”

Cryptocurrency exchanges operating in Hong Kong will have to be licensed by the city’s markets regulator and will only be allowed to provide services to professional investors, according to government proposals to be presented later this year.

Earlier on Friday, China’s state broadcaster CCTV warned against “systemic risks” of cryptocurrency trading in a commentary on its website. “Bitcoin is no longer an investment tool to avoid risks. Rather, it’s speculative instrument,” CCTV said, adding the cryptocurrency is a lightly-regulated asset often used in black market trade, money-laundering, arms smuggling, gambling and drug dealings.

Rival cryptocurrency ether sank 13% to $2,420, down about 45% from a record high of $4,380.64 nine days ago.

“China has tried so often to tackle bitcoin, exchanges, and mining since 2013 that I don’t think this should come as a surprise anymore,” said Ruud Feltkamp, chief executive officer at crypto trading bot Cryptohopper.

“I would be surprised if it is going to have a substantial long-term effect on bitcoin.”

China’s latest campaign against crypto came after the U.S. Treasury Department on Thursday called for new rules that would require large cryptocurrency transfers to be reported to the Internal Revenue Service and the Federal Reserve flagged the risks cryptocurrencies posed to financial stability.

“Nerves remained heightened, and I cannot see liquidity being deeper on Saturdays and Sundays than Monday to Friday, especially after the last week,” said Jeffrey Halley, senior market analyst at OANDA.

“Weekend headline risk could prompt another bout of extended wealth destruction for the weekend warriors.”

Bitcoin markets operate 24/7, setting the stage for price swings at unpredictable hours, with retail and day traders driving those moves.

Reporting by Gertrude Chavez-Dreyfuss in New York and Thyagaraju Adinarayan in London; Additional reporting by Sujata Rao in London, Samuel Shen in Shanghai, and Vidya Ranganathan; Editing by Tom Hogue, Catherine Evans, Kim Coghill and David Gregorio

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