LONDON/TOKYO—Bitcoin tumbled almost 10 percent on Monday as recent volatility in the cryptocurrency market showed no signs of dampening down, with market players citing jitters over China’s expanding clampdown on bitcoin mining in thin liquidity for the losses. Bitcoin fell as low as $32,094 to its lowest in 12 days, dragging smaller coins down. It was last down 8.3 percent, on course for its biggest daily drop in a month. The world’s biggest cryptocurrency, long plagued by volatility, has lost over 20 percent in the last six days alone and is down by half from its April peak of almost $65,000. Still, it has still gained over 10 percent this year. The drop comes amid a growing clampdown on cryptocurrencies in China, where authorities in the southwest province of Sichuan on Friday ordered bitcoin mining projects to close. The State Council, the Chinese regime’s cabinet, last month vowed to clampdown …