The nine deaths in 2016 make North Dakota one of the most dangerous states in the nation based on worker deaths per capita.

MINOT, N.D. (AP) — Yellow ribbons have placed along an expressway in Minot to commemorate the nine workers killed in North Dakota last year.

The display along the East Burdick Expressway Friday is in observance of Workers Memorial Day.

The nine deaths in 2016 make North Dakota one of the most dangerous states in the nation based on worker deaths per capita.

Minot Daily News reports those who died were working in pipeline, oil and gas, garbage collection, materials delivery and the construction industry.

The Occupational Safety and Health Administration says the deaths do not include those that might still be under investigation.

The Missouri Slope Central Labor Council says every day in the United States, 13 workers suffer fatal injuries while on the job.

In 2015, more than 4,800 employees died in the workplace.