Bitcoin prices Friday tumbled almost 13% on reports that Chinese Internet company Baidu Inc. (BIDU, K3SD.SG) stopped accepting payment in the virtual currency following a warning raised by the country's central bank.

The People's Bank of China on Thursday said financial institutions shouldn't take deposits from bitcoin-related businesses or provide them insurance or custody services. The central bank also warned of risks from speculative trading and money laundering associated with bitcoin.

The Chinese government's concerns about bitcoin are a blow to the fledgling currency, which has been surging for weeks partly due to growing interest from China.

The price of a bitcoin stood at $909.71 on Friday, based on the CoinDesk index of three popular exchanges for the currency, down 12.7% on the day.

Several media outlets, including Bloomberg News, reported that Baidu posted an announcement on its website about the suspension of bitcoin payments. Baidu started accepting bitcoin as a payment method for its online security and firewall services in mid-October, although it isn't known how many transactions took place.

A growing number of venture capitalists have been investing in bitcoin-related companies, but widespread volatility about the unregulated currency has created uncertainty about its ultimate value. Bitcoin isn't backed by a central bank and is created through a computer process called "mining."

Bitcoin prices started the year at less than $20, but have surged above $1,000 in recent weeks. Other governments, including the U.S. and France, also have expressed concern about its speculative nature and the potential for money-laundering and illegal activities.

Write to Robin Sidel at robin.sidel@wsj.com

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