Updated

A NATO official says alliance nations may increase their fighting force in Afghanistan by up to 6,000 soldiers in response to President Obama's expected call for 30,000 additional U.S. and allied service members.

Obama is expected to make his announcement next week. NATO will hold a conference Dec. 7 during which the allies can pledge reinforcements.

The NATO official says he expects European and other nations to contribute between 4,000 and 6,000 additional troops. The official said on condition of anonymity that more than a dozen nations have indicated they will respond to Obama's request.

The international force in Afghanistan now includes more than 100,000 troops, including 36,000 supplied by 41 NATO and other allied nations. The rest are Americans.