The US credit risk index is expected to have the largest single-day decline in nearly a month.

With the escalation of tensions in the Middle East, the index measuring the level of credit fear among American companies may experience its largest single-day drop since May 21. As of 16:20 on Tuesday, New York time, the spread of the Markit CDX North American investment-grade index widened by 2.6 basis points to 56.9 basis points. The Markit CDX North American high-yield index fell by 0.55 basis points to 106.1 basis points.