Bitcoin dropped back on Friday after China reiterated its warning that it plans to crack down on crypto mining, even in what’s been a challenging week to get crypto investors.

The most significant cryptocurrency fell 4.8percent to $38,165 as of 11:11% in New York. The announcement late Friday following a meeting of the Financial Stability and Development Committee has been the latest blow in a rough week for its cryptocurrency marketplace, rattled by pressured selling and a potential U.S. taxation clampdown.

China has expressed displeasure with all the anonymity given by Bitcoin along with other crypto tokens, and cautioned earlier in the week which financial institutions were not permitted to take it for the payment. The nation is home to a large concentration of the planet’s crypto miners, or developers using massive computing capability to confirm transactions on the blockchain.

Friday’s selloff struck Bitcoin believers fuming after onetime proponent Elon Musk failed an about-face and criticized the token because of its own energy use. Bitcoin is down about 20 percent since last Friday, though upwards from a Wednesday dip to $30,000. Other coins have shrunk also — Ether is down about 35% over the previous seven sessions.

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The sour stretch for electronic tokens started with Musk suspending approval of Bitcoin obligations at Tesla Inc. and trading barbs with boosters of their cryptocurrency on Twitter. China’s central bank added into the downdraft Tuesday following carrying out a statement warning against using currencies.