Last week saw several new records set on Wall Street. But after Iran closed the Strait of Hormuz again this weekend and the US seized an Iranian ship, the leading indices fell back somewhat.
The broad-based S&P 500 fell 0.2 percent, the tech-heavy Nasdaq closed down 0.3 percent, and the Dow Jones Industrial Average closed unchanged.
The oil price rose again and was around $95 in the evening local time in Sweden.
Companies with high fuel costs fell on Monday. For example, cruise giant Norwegian Cruise Line fell 3.5 percent.
American Airlines has said it is not interested in merging with United Airlines. Shares of American Airlines and United Airlines fell 4.2 percent and 2.8 percent, respectively.
