US stock cautious at open on geopolitical worries and ahead of this week's key event risks

Major US equity indices witnessed a weaker opening on Tuesday amid a fresh wave of global risk-aversion trade in wake of a raft of geopolitical tensions and ahead of this week's key. 

Saudi Arabia, Bahrain, United Arab Emirates and Egypt, in a coordinated move, broke diplomatic ties with Qatar, marked escalating geopolitical tensions in the Middle East. This coupled with uncertainty ahead of the upcoming UK general election and former FBI Chief James Comey’s testimony before a Senate panel on Thursday further dented investors' appetite for riskier assets - like equities.

At the time of writing, the Dow Jones Industrial Average lost around 30-points to 21,155, while the broader S&P 500 Index was down nearly 4-points to 2,432. Meanwhile, tech-heavy Nasdaq Composite Index was nearly unchanged from yesterday's closing level and traded just below 6,300 mark.

Cautious investors' sentiment was evident from the fact that safe-haven remained in favor through European trading session on Tuesday, with gold rising to its highest level in nearly seven weeks and the USD/JPY pair tumbling to the lowest level since April 21.