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/ Source: CNBC.com
Amazon.com's stock dropped 12 percent after the world's largest online retailer posted disappointing quarterly results that missed Wall Street expectations.MICHAELA REHLE / Reuters

Amazon.com posted quarterly results that fell short of expectations and handed in a weak revenue outlook on Thursday, sending shares sharply lower in extended-hours trading.

Stock in the world's largest Internet retailer was more than 12 percent lower at $353 after the Nasdaq's closing bell. It had risen nearly 5 percent during regular trading.

Amazon posted fourth-quarter earnings of 51 cents a share on sales of $25.59 billion. Wall Street analysts had expected profit of 66 cents a share on sales of $26.06 billion, according to a consensus estimates from Thomson Reuters.

In addition, the company posted a current-quarter sales forecast of between $18.2 billion and $19.9 billion. Analysts currently expect $19.67 billion for the first quarter.

The company said international sales gained just 13 percent, lower than Wall Street forecasts for around 14 percent to 15 percent.