• Trader Tommy Kalikas right, works on the floor of the New York Stock Exchange, Monday, Nov. 23, 2015. Stocks are opening slightly lower as the market loses momentum after logging its biggest weekly gain of the year. (AP Photo/Richard Drew)

    European stocks sink as instability fears vex investors

    HONG KONG (AP) — European stock markets opened sharply lower Tuesday as jitters about instability in the Middle East intensified while Asian stock markets dithered as slumping commodity prices weighed on shares of resource companies.