WASHINGTON (AP) -- Workplace suicides surged 28 percent last year, the Labor Department said Thursday, as experts said anxious workers watched colleagues depart in a rash of layoffs and faced survivor's guilt.
At the same time, the agency's Bureau of Labor Statistics said the total number of workers who died on the job from any cause fell by 10 percent.
The 5,071 workplace fatalities recorded in 2008 was the lowest number since the agency began tracking the data in 1992. That number includes 251 suicides, the highest number since official reporting began.
Labor officials did not seek to explain the sudden rise in workplace suicides. A BLS spokesman said the agency plans to research it more extensively.
The agency says economic factors could be responsible for the overall decline in fatalities. Workers on average worked 1 percent fewer hours last year and the construction industry -- which usually accounts for a major share of accidental workplace deaths -- posted even larger declines in employment or hours worked.
Gary Chaison, a professor of industrial relations at Clark University, said the numbers show the struggling economy taking a toll on worker morale.
"Those who are at places where there have been substantial layoffs are trying to cope with survivor's guilt," Chaison said. "I also think there's tremendous anxiety in the American workplace. It's not just being anxious, its being depressed."
But Chaison cautioned that both numbers may be at temporary extremes that will drift back toward historic levels once employment rises and economic conditions improve.
Labor Secretary Hilda Solis called the decline in workplace fatalities a "change in the right direction," but said it does not lessen the need for stronger safety enforcement to prevent accidental injuries.
"Today's report prompts us to step up our vigilance, particularly as the economy regains momentum," Solis said.
The report is based on preliminary numbers that could change once the final report is released next year.
In other findings:
-- Fatal work injuries in the construction sector plunged 20 percent.
-- Workplace homicides dropped by 18 percent.
-- Fatal workplace falls declined by 20 percent last year, after rising to a historic high in 2007.
-- The number of fatal work injuries declined for all age categories except among 16 and 17-year-old workers.