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Smoke rises after an explosion outside Hamid Karzai International Airport. Photo: Haroon Sabawoon/Anadolu Agency via Getty Images

At least 13 U.S. troops and scores of Afghan citizens were killed in a suicide bombing outside the Hamid Karzai International Airport in Kabul on Thursday, U.S. and Afghan officials said.

What we know: The "complex attack" that struck in the sunset of the U.S.' longest war involved an explosion at the Abbey Gate entrance to the airport, the Pentagon said Friday. President Biden blamed ISIS-K for the "vicious attack," and vowed to retaliate.

  • The Pentagon initially said there was a second blast near the Baron Hotel, but clarified Friday: "We do not believe there was a second explosion at or near the Baron Hotel."
  • More than a dozen U.S. troops were injured, officials said Thursday. U.S. Central Command announced Thursday evening that a 13th service member died from wounds suffered from the explosion at Abbey Gate.
  • Scores of Afghans civilians were killed, but the death toll remained unclear Friday morning as officials and hospitals continued efforts to try to identify those killed. AP, citing Afghan officials, reported that more than 160 Afghans were killed. The New York Times, citing hospital officials, reported a similar toll.
  • "The threat from ISIS is extremely real ... we believe it is their desire to continue those attacks and we believe those attacks will continue," U.S. Gen. Kenneth McKenzie told reporters Thursday, adding that preventing attacks will require cooperation with the Taliban, which is controlling access to the area around the airport.

Biden, speaking later on Thursday, said he has directed the Pentagon to develop plans to strike the "assets, leadership and facilities" of ISIS-K, an ISIS affiliate in Afghanistan.

  • "We will not forgive, we will not forget, we will hunt you down and make you pay," he said.
  • "We will respond with force and precision," he added. "We will not be deterred by terrorists."

Biden called the American service members who lost their lives heroes.

  • "They're the spine of America. The best the country has to offer," he said.
  • He defended his decision to withdraw troops by Aug. 31: "It was time to end a 20-year war."
Injured people arrive at a hospital in Kabul. Photo: Sayed Khodaiberdi Sadat/Anadolu Agency via Getty Images

Driving the news: McKenzie said Thursday's attack occurred at a gate where soldiers check people before they enter the airfield.

  • "We have to ensure they're not carrying a bomb," the general said. "That requires physical screening. ... You ultimately have to get very close to that person."
  • "While the air base itself is surrounded with [blast] walls," McKenzie continued, "there's no substitute for ... a young United States man or woman standing out there, conducting a search."
  • "This is close-up work. The breath of the person you are searching is upon you. While we have overwatch in place, we still have to touch the clothes of the person who is coming in," he added.

McKenzie also said the evacuation continues.

  • The State Department is attempting to contact those Americans and determine whether they want to leave, McKenzie added.
A view after an explosion reported outside Hamid Karzai International Airport. Photo: Sayed Khodaiberdi Sadat/Anadolu Agency via Getty Images

The big picture: The explosion followed warnings from the U.S. and allies about a potential terror attack near the airport, where thousands of Afghans have gathered in hopes of fleeing the country.

  • The State Department on Wednesday night urged Americans not to travel to the airport and to leave immediately if they were gathered near the Abbey Gate, East Gate or North Gate. The department reiterated that warning after Thursday's explosion.
  • The U.K. and Australia gave similar warnings. James Heappey, the British armed forces minister, told the BBC that the threat of a suicide attack by ISIS forces was "credible, imminent and lethal."
  • The White House has stressed for several days that the possibility of an attack from ISIS-K was one factor pushing them to attempt to complete the evacuation operation by Aug. 31. 

The Taliban condemned the attack and claimed it took place in an area where the U.S. was handling security.

  • Between the lines: The U.S. has security control of the airport itself but the Taliban is in control beyond the perimeter.

Several NATO allies have ended their evacuation operations due to the terror threat and the need to prioritize the evacuation of U.S. troops over the coming days.

  • Norway's foreign minister has said that the country will no longer be able to evacuate any civilians because "the doors at the airport are now closed and it is no longer possible to get people in."
  • McKenzie noted that 104,000 people have been evacuated since the operation began.
A view after an explosion outside Hamid Karzai International Airport. Photo: Sayed Khodaiberdi Sadat/Anadolu Agency via Getty Images

Go deeper:

Editor's note: This story has been updated and corrected to note that there was only one explosion, not a second one near the Baron Hotel as the Defense Department incorrectly announced Thursday.

Go deeper

Zalmay Khalilzad steps down as Afghanistan envoy

Photo: Susan Walsh-Pool/Getty Images

Zalmay Khalilzad stepped down as special envoy for Afghanistan peace talks on Monday, two months after the Taliban seized control of Kabul in a disastrous conclusion to the 20-year war in Afghanistan.

Why it matters: Khalilzad was the architect of the Trump administration's 2019 peace deal with the Taliban, which the head of U.S. Central Command called "the primary accelerant to lowering morale and general efficiency of the Afghan military."

In photos: The life of Colin Powell

Photo: Paul Morigi/Getty Images for Capital Concerts

Colin Powell, the first Black U.S. secretary of state, died of complications from COVID-19 on Monday.

The big picture: In addition to serving as secretary of state from 2001-05, he also was the first Black security adviser to a president when he served for President Reagan and was the first Black chairman of the Joint Chiefs of Staff for President George H.W. Bush.

  • Powell was fully vaccinated but had undergone treatment for multiple myeloma, a type of blood cancer that can weaken the immune system, a spokesperson said.
8 hours ago - World

Biden seeks to reboot U.S. sanctions policy

Sanctions increased under Obama and dramatically under Trump. Photo: Tom Williams/CQ Roll Call

The Biden administration is rethinking the U.S. approach to sanctions after four years of Donald Trump imposing and escalating them.

The big picture: Sanctions are among the most powerful tools the U.S. has to influence its adversaries’ behavior without using force. But they frequently fail to bring down regimes or moderate their behavior, and they can increase the suffering of civilians and resentment of the U.S.