US stocks start lower in week's first session

US stocks fell in the beginning of trading today, while corporates' first-quarter earnings reports continued to flow in the market, as focus will shift to major companies' reports during the week.

Companies such as Microsoft, Amazon, Ford, Tesla and a number of other companies will reveal their quarterly earnings reports.

On the other hand, the Trump administration announced to stop waivers granted to importers of oil from Iran, which means tightening sanctions against Tehran and the possibility of a fall in the global market supplies.

Markets are still waiting for the final outcome of trade negotiations between the United States and China, despite the positive atmosphere that surrounds them.

At the beginning of trading, Dow fell by 0.3% (equivalent to 71 points) to 26,493 points, and Nasdaq fell 0.2% (14 points) to 7983 points, while Standard & Poors' fell by 0.1% (three points) to 2,902 points.