WASHINGTON (AP) — The number of people applying for U.S. unemployment benefits dropped by a sharp 36,000 last week to a seasonally adjusted 280,000, a sign that the job market is strengthening.

The four-week average of applications, a less volatile measure, fell 4,750 to 299,500, the Labor Department said Thursday. The total number of people collecting benefits during the first week of September was 2.43 million, the fewest since May 2007.