There's less than a week until the US's Afghanistan withdrawal deadline

Secretary of State Antony Blinken said that there are approximately 1,500 people who may be Americans left in the country, and added that when evacuation operations began, there was a population of as many as 6,000 American citizens in Afghanistan who wanted to leave.

Blinken said the US has “evacuated at least 4,500 American citizens and likely more” since Aug. 14, and more than 500 were evacuated in the last day alone.

“Over the past 24 hours we’ve been in direct contact with approximately 500 additional Americans and provided specific instructions on how to get to the airport safely,” he said. 

“For the remaining roughly 1,000 contacts that we had who may be Americans seeking to leave Afghanistan, we’re aggressively reaching out to them multiple times a day through multiple channels of communication,” Blinken said.

He noted that some may have left the country, some may not actually be Americans, and some may choose to stay. 

He said the State Department believes “the number of Americans actively seeking to leave Afghanistan is lower, likely significantly lower,” but noted that they are “dynamic” calculations. 

Blinken noted that Americans are not required to register with the State Department, making precise counts difficult. 

A senior State Department officials said the department is reaching out “incessantly” to the group of 1,000 people believed to be Americans who may wish to leave Afghanistan, but “in many cases, we have not heard back from them."

The official said they are “using every form of contact that we have to determine a few things: number one, if they are in fact American citizens. Number two, If they wish to leave, where they are, if they would be traveling with families and how we can help them.

They said not hearing back from the people “could mean any number of things.”

“It could mean that that is the person on the end of the line isn't in fact, a passport holder. There was some error in the data. It could mean that they've already left, and we certainly expect that applies to a number of Americans,” the official said, noting the department had warned US citizens for months to leave Afghanistan. 

“We are not going to leave anything to chance. That is why we are calling and re-calling, emailing and re-emailing this universe of individuals we believe may be American citizens who’re still in Afghanistan,” they said.

US Secretary of State Antony Blinken shared some figures today about the ongoing efforts to get Americans and other allies out of Afghanistan.

Blinken added: "Only the United States could organize and execute a mission of this scale and this complexity."

Secretary of State Antony Blinken is speaking now about US efforts to evacuate Americans from Afghanistan after his remarks originally scheduled for 12:15 p.m. ET were delayed.

President Biden said Tuesday evening that he had asked Blinken to give the public “an update and a detailed report on exactly how many Americans are still in Afghanistan, how many we got out and what our projection is.”

White House officials have repeatedly said they do not know exactly how many Americans are in Afghanistan.

White House national security adviser Jake Sullivan said Monday that the US doesn’t know the exact figure because some Americans entered the country without registering with the US Embassy in Kabul and others left the country without deregistering.

Pentagon press secretary John Kirby, during the Pentagon briefing on Wednesday morning, said at least 4,400 Americans had been evacuated but did not provide a total number of Americans who are still in need of evacuation.

Earlier today, the Pentagon announced that a total of 19,000 evacuees left Afghanistan in the last 24 hours, with 42 US military aircraft carrying 11,200 people and another 7,800 people evacuated by coalition partners.

The Pentagon said there are more than 10,000 people waiting at the airport to leave but that the number would change as more people arrive at the airport and as flights depart.

CNN's Jason Hoffman, Nicole Gaouette and Jennifer Hansler contributed reporting to this post.

The evacuation efforts at Kabul airport are “an undertaking of historically massive proportions,” a source familiar with the current situation at Kabul airport tells CNN.  

“The conditions at the Kabul airport are no better for the military than for the refugees,” the source continued. “Soldiers and Marines are working for days on end in 100-plus degree heat and terrible sanitary conditions with one meal per day. Staff have limited connectivity to exercise command and control, and are overwhelmed with special interest requests from Congress, the White House, and private organizations.”

There is a common misconception that state or defense personnel are able to easily "open the gate" to meet an individual or group, the source tells CNN. “As if the most heavily fortified airport in the world is nothing more than a backyard,” the source added.  

As tension continues to grow in Afghanistan, so too does the chaos outside of Kabul's international airport as time is running out for many to escape from the Taliban.

One video shared on social media shows a man who was purportedly beaten by the Taliban while he was trying to get to the airport. In the footage, the man can be seen with blood running down his face while talking to the camera saying partly in English, "They hit me bad" and that "this happened to me when I was crossing .... Airport." In the same footage, gunshots can be heard purportedly fired by the Taliban to intimidate people. 

Another social media video showed big crowds of people waiting outside the north wall at Kabul Airport, hoping to get into the airport and holding up their documents to the US military soldiers and Nato troops who were guarding the wall.

On Tuesday during a press conference, Taliban spokesman Zabiullah Mujahid said, “The road, which goes to the Airport, is blocked. Afghans cannot take that road to go to the airport, but foreign nationals are allowed to take that road to the airport.”

Some context: The Pentagon announced Wednesday that a total of 19,000 evacuees left Afghanistan in the last 24 hours, with 42 US Military aircraft carrying 11,200 and another 7,800 evacuated by coalition partners.

There are currently more than 10,000 people waiting at the airport to leave, but that the number could change as more people arrive at the airport and as flights depart, Joint Staff deputy director for regional operations Army Maj. Gen. William "Hank" Taylor said in a briefing with reporters.

The Turkish Armed Forces has begun to evacuate from Kabul airport and return to Turkey after “successfully fulfilling the task entrusted to them,” the Turkish Defense Ministry said in a statement regarding Turkish soldiers serving in Afghanistan. 

The ministry announced the decision came as a result of the assessment following “various meetings, current situation and conditions.”

Turkish presidential spokesperson Ibrahim Kalin tweeted that “after fulfilling their duties in an excellent and honored way, Turkish soldiers in Afghanistan are returning home. Turkey will continue to work for the peace, security and prosperity of our Afghan brothers and sisters.”

Secretary of State Antony Blinken said there are about 1,500 people who may be Americans left in the country and added that when evacuation operations began, there was a population of as many as 6,000 American citizens in Afghanistan who wanted to leave.

Blinken said the US has “evacuated at least 4,500 American citizens and likely more” since Aug. 14, and more than 500 were evacuated in the last day alone.

Blinken noted that some may have left the country, some may not actually be Americans and some may choose to stay. Blinken said Americans are not required to register with the State Department, making precise counts difficult.

The State Department believes "the number of Americans actively seeking to leave Afghanistan is lower, likely significantly lower," but noted that they are "dynamic" calculations, Blinken added.

In a briefing to congressional staff earlier today, a Senate aide told CNN the State Department said that at least 4,100 American citizens are still actively seeking to get out of Afghanistan. The source said not all the Americans are located in and around Kabul.

President Biden said Tuesday he had asked Blinken to give the public “an update and a detailed report on exactly how many Americans are still in Afghanistan, how many we got out and what our projection is.”

Earlier today, the Pentagon announced that a total of 19,000 evacuees left Afghanistan in the last 24 hours, with 42 US military aircraft carrying 11,200 people and another 7,800 people evacuated by coalition partners.

The Pentagon said there are more than 10,000 people waiting at the airport to leave but that the number would change as more people arrive at the airport and as flights depart.

Update: This post has been updated to reflect the estimated number of American citizens who may be in Afghanistan as stated by Secretary of State Antony Blinken.

CNN's Jennifer Hansler contributed reporting to this post. 

The Taliban have agreed to let Afghan nationals with legal documents travel after Aug. 31, German Ambassador to Afghanistan Markus Potzel tweeted Wednesday.

Potzel met with Sher Mohammad Abbas Stanekzai, the Deputy Head of the Taliban’s political bureau, and his team "for a comprehensive discussion" in Doha on Tuesday, Potzel said.

They discussed an "urgent need" for a functioning airport in Kabul as a prerequisite for diplomatic and NGO presence in Afghanistan.

Some background: This comes one day after the Taliban said they were "not allowing the evacuation of Afghans anymore" and warned that the US must stick to next week's deadline to pull out.

Taliban spokesperson Zabiullah Mujahid told a press conference Tuesday that while foreign nationals could continue traveling to the airport, the huge crowds of Afghans that have gathered there in recent days should return home and would not face reprisals from the country's new rulers.

"The road, which goes to the airport, is blocked. Afghans cannot take that road to go to the airport, but foreign nationals are allowed to take that road to the airport," Mujahid said.

"We are not allowing the evacuation of Afghans anymore and we are not happy with it either," he added.

Afghan evacuees are continuing to arrive at the Joint Base McGuire-Dix-Lakehurst in New Jersey, according to base media relations officials. 

Chief of Media Relations Derek VanHorn said in a statement that arrivals began overnight on Tuesday and are expected to continue through the coming days. 

VanHorn said the Joint Base McGuire-Dix-Lakehurst is one of four military installations to temporarily house Afghan evacuees including bases in Wisconsin, Texas and Virginia.  

The military installations are providing evacuees with temporary lodging, basic needs, transportation and medical screening services in a secure environment. The Department of Defense is working to build capacity at the existing military installations and potentially other locations, according to VanHorn.