U.S. stock index futures were mixed on Tuesday as a number of companies posted quarterly results.
On the data front, Tuesday will see Purchasing Managers Index (PMI) released at 9:45 a.m ET with existing home sales and Richmond Fed survey data due at 10 a.m ET.
In Europe, the pan-European Stoxx 600 index was around 0.1 percent higher on Tuesday morning. In Asia, the Shanghai Composite in China closed 0.2 percent higher, while the Nikkei in Japan closed 0.55 percent lower.
In oil markets, prices moved higher on Tuesday after evidence that OPEC and other oil exporters would commit to reducing production however an increase in drilling in the U.S. could cap further gains.