More Americans than forecast filed applications for unemployment benefits last week, raising the possibility that a greater-than-usual increase in temporary holiday hiring boosted December payrolls.

Jobless claims climbed by 24,000 to 399,000 in the week ended Jan. 7, Labor Department figures showed today in Washington. The median forecast of 46 economists in a Bloomberg News survey projected 375,000. The number of people on unemployment benefit rolls rose, while those receiving extended payments decreased.

Hiring by package delivery companies and retailers during the holidays to meet demand for gifts may now be giving way to an increase in dismissals. At the same time, claims figures are subject to greater volatility during this time of year, as the government has trouble adjusting the data for the seasonal swings in employment.