Asian stocks fell, with the regional index heading for its first weekly loss in more than a month, as concern grew that the U.S. political impasse could lead to the government defaulting on its debt.

Nikkei 225 14,024.31 -132.94 -0.94%

Hang Seng 23,119.25 -95.15 -0.41%

S&P/ASX 200 5,208.02 -26.87 -0.51%

Shanghai Composite 2,174.66 +14.64 +0.68%

Blumont Group Ltd. , which invests in minerals and energy resources, slumped 56 percent in Singapore before trading was suspended after it agreed to buy an unnamed overseas coal producer.

Digital Garage Inc.  sank 10 percent after a Twitter Inc. filing failed to mention the Tokyo-based company as a shareholder.

Universal Robina Corp. slipped 4.9 percent after parent JG Summit Holdings Inc. sold shares of the Philippine food and beverage company at a discount.