A twin suicide bomb attack killed more than 100 people outside Kabul airport on Thursday, according to AP. A Taliban official earlier said that the deceased include children, according to a Reuters report. Earlier, the news of one of the explosions was confirmed by the Pentagon. Thousands of people had gathered at the Kabul airport to flee the country as part of evacuation operations of several countries triggered by Taliban's take over of Afghanistan earlier this month.

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 The U.S. says further attempted attacks are expected ahead of the Tuesday deadline for foreign troops to leave, ending America’s longest war.

Thursday’s bombings near Kabul’s international airport killed at least 95 Afghans and 13 U.S. troops, Afghan and U.S. officials said, in the deadliest day for U.S. forces in Afghanistan since August 2011. An official said Friday that the true toll could be higher because other people may have taken bodies away from the scene, speaking on condition of anonymity because they were not authorized to speak to the media.

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The explosion went off in a crowd of people waiting to enter the airport, according to Adam Khan, an Afghan waiting nearby. He said several people appeared to have been killed or wounded, including some who lost body parts, reports Associated Press.

Earlier on Thursday, UK and several other countries had warned of a possible terror attack on Kabul's airport. 

Several countries had urged their citizens to avoid the airport, where an official said that there was threat of a suicide bombing. But with days left for evacuation efforts to end, few appeared the heed the warnings.

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The Kabul airport has been at the centre of the humanitarian crisis unfolding in Afghanistan since the Taliban took over. Thousands of people, including Afghans, have been trying to flee the country. The Taliban, on the other hand, have warned the US against encouraging Afghans to leave the country. 

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In the 11 days since the Taliban seized power in Afghanistan, the United States and its allies have mounted one of the biggest air evacuation efforts in history, bringing out close to 88,000 people from the war-ravaged nation, according to Al Jazeera.

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The Taliban fighters have been guarding the perimeter of the Kabul airport. Media reports indicate that there are nearly 15,000 US passport holders meant to be evacuated stationed in Kabul. 

(With inputs from The Associated Press)