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WASHINGTON – The number of people filing new claims  for unemployment benefits  unexpectedly rose last week by the largest amount in three months. The surge is evidence of how volatile the job market remains, even as the economy grows.

Applications for unemployment benefits rose to 471,000 last week, up by 25,000 from the previous week, the Labor Department said Thursday. It was the first increase in five weeks and the biggest jump since a gain of 40,000 in February.

The total was the highest since new claims reached 480,000 on April 10. It also pushed the average for the last four weeks to 453,500.