The U.S. military conducted airstrikes in Afghanistan over the past few days to support government security forces, the Pentagon said on Thursday.

Pentagon spokesperson John Kirby said that "in the last several days, we have acted, through airstrikes, to support the ANDSF (Afghan National Defense and Security Forces)," without providing details. But he reiterated Defense Secretary Lloyd Austin's Wednesday statement that the United States remains "committed to helping the Afghan security forces and the Afghan government going forward." 

A defense official told the Associated Press that the U.S. military conducted more than four airstrikes on Wednesday and Thursday. 

At least two of the strikes targeted military equipment that the Taliban had taken from the Afghan forces, and others aimed at Taliban fighting positions, including at least one strike in the southern province of Kandahar, said the report.

U.S. airpower has long provided Afghan forces with a tactical advantage against the Taliban, one that many fear will be eroded by the withdrawal of international troops.

Also on Wednesday, the chairman of the U.S. Joint Chiefs of Staff, General Mark Milley, acknowledged the Taliban now control about half of Afghanistan's roughly 400 districts, but added they had taken none of the country's densely populated main cities. 

He said the U.S. withdrawal, set to be finished by August 31, is now 95 percent complete.

The resurgent militants have pressed a sweeping offensive against government forces since May, amid the withdrawal of the American-led foreign forces.

A Taliban spokesman on Thursday told Russian media that the group now controlled 90 percent of Afghanistan's borders, but the claim could not be independently verified.

(With input from agencies)