Applications for jobless benefits jumped by 43,000 to 474,000 in the week ended April 30, the most since August, Labor Department figures showed today. A spring break holiday in New York, a new emergency benefits program in Oregon and auto shutdowns caused by the disaster in Japan were the main reasons for the surge, a Labor Department spokesman said as the data was released to the press.

Even before last week, claims had drifted up, raising concern the improvement in the labor market has stalled. Employers added 185,000 workers to payrolls in April, fewer than in the prior month, and the unemployment rate held at 8.8 percent, economists project a Labor Department report to show tomorrow.