Asian equities tumbled Friday as analysts warned the volatility that has characterised markets during the coronavirus crisis is likely to continue for some time.

While governments and central banks have unleashed or prepared to roll out stimulus measures, the rapid spread of the disease and rising death toll are putting a strain on economies and stoking concerns of a worldwide recession.

And with no end seemingly in sight -- almost 100,000 people in 85 countries have now been infected -- investors are fleeing out of risk assets such as stocks and into safe havens including the yen and gold.

"All we know now is that we don't really understand what's going to happen next," Michael Shaoul, head of Marketfield Asset Management, told Bloomberg TV.

"It's probably four, six, eight weeks before we're going to have any useful information as to what the trajectory of the virus is and what the actual economic fallout looks like."

The epidemic has wreaked havoc on international business, tourism, schools and sports events, and the World Health Organization raised concerns about how the outbreak was being handled.

On Friday S&P Global warned that the crisis could wipe $211 billion off Asia-Pacific GDP this year and send growth to just 4.0 percent, its weakest since the financial crisis.

Tokyo ended the day down 2.7  percent, while Shanghai fell 1.2 percent and Hong Kong shed 2.3 percent.

Sydney, Seoul, Bangkok and Jakarta all lost more than two percent, while Singapore, Wellington, Taipei and Manila were more than one percent down.

Mumbai plunged three percent, with Yes Bank crashing more than 70 percent at one point after the central bank seized control and imposed withdrawal limits as it struggles with a mountain of bad debt.

In early trade, London dived 1.8 percent, while Paris and Frankfurt each retreated two percent.

CMC Markets analyst David Madden said the fact that so many governments around the world were now putting resources into the fight had in itself spooked traders. "At a certain point... intervention increases nervousness," he wrote in a note.

Crude extends losses

Observers also suggested the selling was fired by investors protecting their portfolios ahead of the weekend in case of any more negative headlines, with warnings that monetary policy only had a limited effect as the virus continues to spread.

"Investors are starting to price in worst-case scenarios... and are now accelerating their hedging game plans for the eventuality of the eurozone falling into recession and the US economy stagnating in the first half of the year," said AxiCorp's Stephen Innes. 

With dealers flocking to safety and yields on US Treasuries at record lows, gold has rallied more than five percent this week to sit at more than seven-year highs.

And the yen, the main go-to currency for traders in times of crisis, continued to rise against the dollar, with the Federal Reserve's shock rate cut this week adding to downward pressure on the greenback.

The dollar has lost more than five percent against the yen in two weeks and observers say the Japanese government could step in to prevent its unit strengthening further if the greenback drops below 105.50 yen.

Crude prices extended losses, a day after Brent fell below $50 for the first time since 2017.

News that OPEC ministers had recommended a huge production cut of 1.5 million barrels a day to offset the impact of the virus was unable to provide traders with any lift.

There are concerns over whether key producers outside the group -- Russia in particular -- will follow the advice.

Both main oil contracts have lost more than a fifth of their value so far in 2020.

Key figures around 0820 GMT

Tokyo - Nikkei 225: DOWN 2.7 percent at 20,749.75 (close) 

Hong Kong - Hang Seng: DOWN 2.3 percent at 26,146.67 (close)

Shanghai - Composite: DOWN 1.2 percent at 3,034.51 (close)

London - FTSE 100: DOWN 1.8 percent at 6,584.50

Dollar/yen: DOWN at 105.90 yen from 106.14 yen at 2200 GMT

Euro/dollar: DOWN at $1.1231 from $1.1238

Pound/dollar: UP at $1.2970 from $1.2954

Euro/pound: DOWN at 86.59 pence from 86.74 pence

Brent Crude: DOWN 1.0 percent at $49.50 per barrel

West Texas Intermediate: DOWN 1.0 percent at $45.44

New York - Dow: DOWN 3.6 percent at 26,121.28 (close)

European Sink

European stock markets sank further at the open on Friday in a fierce global sell-off as traders fretted that the coronavirus crisis is set to continue for some time.

In initial deals, with London's benchmark FTSE 100 index of major blue-chip companies lost 1.5 percent at 6,604.04 points.

In the eurozone, Frankfurt's DAX 30 shed 1.8 percent to 11,734.85 points and the Paris CAC 40 dropped 1.8 percent to 5,264.30, compared with the closing levels on Thursday.

In Asia, Hong Kong and Shanghai stocks also tanked as the coronavirus crisis overshadows government and central bank moves to limit the economic impact.