More people applied for U.S. unemployment benefits last week, although jobless claims continue to be close to pre-recession levels, AP reported. Weekly applications for unemployment aid climbed 21,000 to a seasonally adjusted 311,000, the Labor Department said Thursday. The prior week's was revised up slightly to 290,000. The four-week average, a less volatile measure, rose 2,000 to 295,750. That continues to be close to averages that predate the beginning of the Great Recession in late 2007. Applications are a proxy for layoffs. When fewer employers shed workers, it suggests potentially rising incomes, increased hiring activity and confidence that the economy is improving. Employers are searching for more workers.