US troops guarding the evacuation effort at Kabul airport fired some shots in the air overnight to control crowds, but there were no indications of casualties or injuries, according to the Pentagon.
Spokesman John Kirby told a news briefing on Wednesday that no shots were fired by American troops at Afghans or anybody else.
Kirby said the number of US troops at Kabul's international airport reached about 4,500 on Wednesday and several hundred more were expected over the next 24 hours.
"Some shots were fired, largely around the gate areas. And it's our understanding that at least some of these ... were fired by US personnel on the airport side of the perimeter as crowd-control measures, as non-lethal warnings," Kirby said.
A Taliban official said separately Taliban commanders and fighters were firing into the air on Wednesday to disperse crowds at the Kabul airport.
"We have no intention to injure anyone," the official told Reuters.
Chaos has continued outside the airport, the official said, blaming Western forces for a "chaotic evacuation plan" from Afghanistan.
At least three people were killed in anti-Taliban protests in the Afghan city of Jalalabad on Wednesday, witnesses said, as the Taliban moved to set up a government following the collapse of the US-backed administration and military and Western countries stepped up evacuations of diplomats and civilians.
Kirby said US officials were in touch with the Taliban to try to speed the evacuation process.
"We're not unaware that there have been issues out in town and harassment of individuals," he said. "We're in communication with the Taliban; we want to see this process go more smoothly. We certainly want it to go faster and with more capacity."