All American diplomats have been moved from the U.S. Embassy in Kabul to the capital city's airport, the State Department said late Sunday evening, after a chaotic day in which Taliban fighters entered the city and the Pentagon dispatched fresh troops to evacuate U.S. personnel and Afghan allies.  “We can confirm that the safe evacuation of all embassy personnel is now complete," State Department spokesman Ned Price said in a statement.

"All embassy personnel are located on the premises of Hamid Karzai International Airport, whose perimeter is secured by the U.S. military.” Earlier on Sunday, the U.S. Embassy in Kabul issued an urgent alert warning American citizens  to "shelter in place" amid reports of gunfire at the airport on the outskirts of Afghanistan's capital city.  The embassy's security alert came as U.S. troops were evacuating diplomatic staff from the embassy to the airport and as the Taliban entered Kabul, seemingly poised to take over the government.

"The security situation in Kabul is changing quickly," the U.S. Embassy notice said. "There are reports of the airport taking fire; therefore we are instructing U.S. citizens to shelter in place." The State Department said America's top diplomat in Afghanistan, Ross Wilson, was among those who had been "relocated" to the airport.  "The American flag has been lowered from the U.S. Embassy compound and is now securely located with embassy staff," a State Department spokesperson said. Secretary of State Antony Blinken has been "in close, regular contact" with Wilson, who is now based at the airport, the agency said.

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