The number of initial claims for regular state unemployment insurance benefits fell 27,000 to 451,000, seasonally adjusted, in the week ended Sept. 4, the Labor Department reported Thursday. Economists polled by MarketWatch had expected a level of 470,000. The four-week average of initial claims -- a more accurate gauge of employment trends -- fell 9,250 to 477,750. The number of workers who continued to receive state unemployment checks fell by 2,000 to 4.48 million in the week ended Aug. 28. The four-week average of these continuing claims fell 3,250 to 4.49 million, the lowest level since December of 2008.