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First Posted: 9/27/2012 ATHENS, Greece &amp;#8212; Europe's fragile financial calm was shattered Wednesday as investors worried that violent anti-austerity protests in Greece and debt troubles in Spain showed the continent still cannot contain its financial crisis. 
Police fired tear gas Wednesday at rioters throwing gasoline bombs and chunks of marble during Greece's largest anti-austerity demonstration in six months. 
In Madrid, thousands of angry protesters again swarmed as close as they could get Wednesday night to Parliament, watched by a heavy contingent of riot police. 
Spain's central bank warned Wednesday the country's economy continues to shrink "significantly," sending the Spanish stock index tumbling and its borrowing costs rising. 
The turmoil Wednesday ended weeks of relative calm and optimism among investors that Europe and eurozone might have turned a corner. Markets have been breathing easier since the European Central Bank said earlier this month it would buy unlimited amounts of government bonds to help countries with their debts. 
Spain has struggled for months to convince investors that it can handle its debts. The government is to unveil an austere 2013 draft budget and new economic reforms today. Although Greece accounts for only about 2 percent of the eurozone's total economy, its crisis has shaken the euro and led to concern it could destabilize other, much larger economies in the 17-nation bloc. Greece is in its fifth year of recession, with unemployment above 24 percent.

Riots upset the markets