Markets Tumbling - Dow Down 135

US stocks are trading in the red.

The Dow is down 137 points (-0.8%). The S&P is down 13 points (-0.6%).

The US economic calendar is light today. At 10:00 a.m., we'll get the Job Openings And Labor Turnover Survey. Economists estimate US companies had 4.7 million job openings in August.

Earlier, we learned German industrial production activity dropped 4% in August, which was much worse than the 1.5% expected. This only adds to concerns that Europe's second largest economy will drag the whole eurozone into a recession.

Among the big losers in the US markets is SodaStream, which warned that its Q3 revenue and earnings have fallen far short of analysts forecasts. Shares are down 20% in early trading.