By V. Phani Kumar, MarketWatch

HONG KONG (MarketWatch) -- Japanese stocks plunged deep into losses Friday afternoon on a wave of selling, as remarks from the Bank of Japan governor failed to ease concerns about a rise in government-bond yields.

The Nikkei Stock Average , up more than 3% at one point earlier in the day, was yanked to losses in excess of 3% in extremely volatile afternoon trading.

Less than an hour ahead of the close, the benchmark was down 1.7%, while the broader Topix was off 1.3%.

The steep losses came even as Bank of Japan Gov. Haruhiko Kuroda said stability in the country's debt markets was "extremely desirable," and that the central bank would strengthen communication with the markets to head off volatility in bond yields.

"He is trying to make money cheaper, but [the] Japanese government bond yield is going the other way, and he hasn't said how he's going to stabilize bond-market yield. ... That's worrying the market," said Kim Eng Securities director of sales trading Andrew Sullivan.

The Nikkei Average had plunged 7.3% on Thursday for its worst decline since March 15, 2011. The losses came against the backdrop of extreme volatility in the bond market, which forced the Bank of Japan to step in and offer funds to soothe investor nerves.

The yield on the 10-year Japanese government bond (JGB) yield rose to 1% Thursday before recovering, even as the Bank of Japan last month announced plans to buy JGBs on an unprecedented scale.

On Friday afternoon, the 10-year yield was at 0.84%, according to FactSet data.

Sullivan said the severe market reaction also reflected investors' unwillingness to take risks ahead of the weekend, with a slew of economic data due later on Friday from the U.S. and Europe.

The U.S. was slated to release numbers on monthly durable goods orders later on Friday. Germany was slated to issue its May edition of the IFO index on business confidence.

The sell-off also came as the U.S. dollar (USDJPY) plunged as low as Yen101.05 after Kuroda's remarks, far off the day's high at Yen102.58.

Among the movers, shares of Renesas Electronics Corp. plunged 8.8%, and Fast Retailing Co. (FRCOY) tumbled 5%, while Nomura Holdings Inc. (NMR) skidded 4.3%.

Other markets follow lower

Other regional markets also followed Japanese stocks lower, giving up their initial gains. Australian shares were hit particularly hard, skidding on extended losses for the banking and resource sectors.

The S&P/ASX 200 fell 2% in Sydney, dropping further amid worries about Chinese economic growth after disappointing preliminary results from HSBC's survey on manufacturing activity in China.

South Korea's Kospi lost 0.2%, China's Shanghai Composite traded flat, and Taiwan's Taiex edged 0.6% lower, while Hong Kong's Hang Seng Index was off 0.4%.

Financial stocks declined in Sydney amid worries about the economic outlook. Commonwealth Bank of Australia (CBAUY) fell 2.3%, and National Australia Bank Ltd. (NABZY) dropped 1.4%.

Resource-sector stocks dropped amid lingering concerns about demand in the wake of Thursday's China manufacturing data.

BHP Billiton Ltd. (BHP) lost 1.4%, and Woodside Petroleum Ltd. (WOPEY) gave up 1.6%.

However, Newcrest Mining Ltd. (NCMGF) rose 3.3% after gold futures rallied overnight.

Shares of Echo Entertainment Group Ltd. plunged 12.9% after Crown Ltd. sold a 10% stake in the casino operator.

In Hong Kong, shares of Lenovo Group Ltd. (LNVGY) jumped 4.1%, on top of the 2.9% advance Thursday in the wake of a 34% jump in annual profit for the computer maker.

But some property developers and insurers mostly fell to keep the market under pressure, with China Overseas Land & Investment Ltd. (CAOVY) losing 2.1%, and China Life Insurance Co. (LFC) down 1.7%.

Developer Cheung Kong Holdings Ltd. (CHEUY) fell 2.6% as the stock traded without rights to a dividend.

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