The number of Americans filing applications for jobless benefits increased more than expected last week, but the underlying trend continued to point to labor market strength despite ongoing financial market volatility.

Initial claims for state unemployment benefits rose 10,000 to a seasonally adjusted 231,000 for the week ended Dec. 29, the Labor Department said on Thursday. Data for the prior week was revised higher to show 5,000 more applications received than previously reported.

Economists polled by Reuters had forecast claims increasing to 220,000 in the latest week.

The Labor Department said claims for California and Virginia were estimated last week. Unadjusted claims for both of those states declined last week.

A Labor department official said there was no indication of an increase in filings last week from federal workers furloughed because of a partial shutdown of the government that is now in its second week.

Data on claims filed by federal employees is released with a one-week lag. The shutdown, which started on Dec. 22, was triggered by President Donald Trump's demand for $5 billion in border wall funding.

Some 800,000 employees from the Departments of Homeland Security, Transportation, Commerce and others have been furloughed or are working without pay.

Claims data tends to be noisy around year-end holidays. The four-week moving average of initial claims, considered a better measure of labor market trends as it irons out week-to-week volatility, slipped 500 to 218,750 last week.

Last week's claims data has no bearing on December's employment report which is scheduled for release on Friday as it falls outside the survey period.