Wall Street set to open higher in cautious trading

Wall Street looked set to open higher on Tuesday as investors appeared to have shrugged off the potential impact from increased political tensions following Monday's deadly attacks in Turkey and Germany. Wall Street extended a recent rally on Monday but finished the session short of earlier highs as risk aversion set in following the killing of Russian ambassador to Turkey in Ankara and a truck attack in Germany. "2016 is ending with tragic incidents in Turkey and Germany, but investors have bec