The United States has announced at least 13 troops are believed to have died in the Kabul airport blast.
Reports say at least four US Marines were among several killed in the attack thought to have killed more than 70 people so far, including 60 Afghans.
The US military's death toll has since risen to at least 13 servicemen, according to the Reuters news agency..
The devastating blast ripped through the area where desperate Afghans hoping to be evacuated had gathered.
The suspected suicide bombing targeted the sewage canals outside Hamid Karzai International Airport where people had gathered to wait in hopes of being flown to safety from Taliban rule.
There have been no reports of UK troops injured at this stage as twin bombings sparked fresh chaos and suffering in Afghanistan's capital, with authorities yet to confirm whether ISIS is believed to have been behind the blasts.
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The Taliban have told media children are believed to be among the dead, according to Sky News.
Taliban guards are also said to be among those killed, with more than 60 more people injured across the two bombing sites.
The Pentagon had earlier confirmed twin blasts occurred in a "complex attack" outside Hamid Karzai International Airport, and there were "a number of US and civilian casualties".
At least one explosion took place at or near the Baron Hotel, where the UK has been processing Britons and Afghans eligible for evacuation after the Taliban seized control of the nation.
Another blast occurred a short distance away near the Abbey Gate of Kabul's airport, US officials added.
The Wall Street Journal reported the US ambassador in Kabul has been informed four US Marines were among the dead, and three more troops were wounded.
The Ministry of Defence (MoD) said there had been no UK troops or personnel casualties reported.
The MoD did not confirm or deny whether the ISIS splinter cell, Isis-K, was believed to be behind the explosions, after earlier warnings about the terror group in Afghanistan.
However Western governments had repeatedly warned citizens not to approach the airport, amid fears of an imminent attack by ISIS affiliates.
The Taliban's spokesman condemned the attack - which targeted the area where Afghans waiting to flee its rule had gathered.
Prime Minister Boris Johnson has vowed to continue the UK's evacuation effort following the bombings.
The UK, the US and other nations have been drawing closer to the August 31 deadline to help tens of thousands of citizens flee Afghanistan.
Refugees are facing the fear of an uncertain future as Western leaders say not everyone hoping to board a flight out of Kabul will be able to do so.
Those left behind, including interpreters who helped allied forces, fear reprisal under Taliban rule.
While the group has insisted it has changed its barbaric ways as it regains power, international observers fear women could be stripped of their rights and political opponents targeted under its strict Islamic laws.
