Stocks are sliding (DB, TWTR, SPY, QQQ, DIA, TLT)

US stocks are tumbling on Monday as the market looks ahead with uncertainty to the US presidential debate and OPEC's informal meeting in Algiers. 
At 12:10 p.m. ET, the Dow was down 143.85 points (-0.79%), the S&P 500 was lower by 14.29 points (-0.67%) and the Nasdaq was off 40.91 points (-0.77%). 
The financial and healthcare sectors of the S&P 500 led declines, each down 1.1%.
Deutsche Bank shares slumped 6.5% to a record low after reports surfac