Source: Yaroslav Trofimov, Sune Engel Rasmussen 

An explosion ripped through a crowd of Afghans trying to enter Kabul airport Thursday, just as America’s allies said they were halting evacuation flights from Afghanistan, leaving behind citizens and thousands of Afghans who had been cleared for entry.

There were no immediate details on the extent of casualties, Pentagon Press Secretary John Kirby said. Western governments have repeatedly warned of an imminent attack by Islamic State and urged their citizens not to approach the airport on Thursday.

As the airlift opportunities began disappearing, desperate Afghans and foreign citizens still tried to reach Kabul’s international airport but on Thursday morning found the roads blocked by Taliban checkpoints.

“Everything is over,” said a 30-year-old teacher who tried to get to the airport. “They’re not letting anyone pass, not even those with foreign passports or visas.”

Thousands of Western citizens and permanent residents are still stranded in Afghanistan, and many fear that they will now be abandoned to face possible Taliban retribution. Secretary of State Antony Blinken said Wednesday that approximately 1,500 American citizens were still in Taliban-controlled Afghanistan, and that Washington was in touch with some 500 of them, trying to organize evacuations.

Bismillah, a green-card holder residing in Sacramento, Calif., said he traveled to the northern Afghan city of Mazar-e-Sharif to visit his parents Aug. 3 with his wife, also a U.S. permanent resident, and their 8-month-old son, a U.S. citizen. The family made their way to Kabul as the Afghan government collapsed on Aug. 15, but Bismillah, who declined to provide his last name, said he feared that his baby would be crushed to death in the crowds and didn’t try to reach the airport.

“I feel like we are going to be left behind. I don’t know what is going to happen next week—you cannot forecast even one day about what will happen in Afghanistan,” said Bismillah, who worked for Inc. in California and is currently in Mazar-e-Sharif. “We are really worried about ourselves.”

The evacuations are ending as the Taliban cement their hold over the country. Though the Islamist movement’s leaders have met with prominent figures from the fallen Afghan republic, such as former President Hamid Karzai and chief peace negotiator Abdullah Abdullah, the visits were mostly courtesy and didn’t discuss power sharing, a person familiar with the meetings said. Mr. Karzai, in particular, had been strongly advised not to leave his compound for his own safety, a soft form of house arrest, the person said.

Since Aug. 14, the day before the Taliban took control of Kabul, the U.S. has evacuated and facilitated the evacuation of approximately 95,700 people from Afghanistan, the White House said. In the 24 hours ending at 3 a.m. ET Thursday, about 13,400 people were evacuated, approximately 5,100 of them on U.S. military flights, it said.

The Dutch Defense Ministry said in a letter Thursday to parliament that it would stop flight operations by the end of the day, hoping to evacuate several hundred people already inside the airport, with diplomatic staff and Dutch troops departing on the final flight. The ministry added that it was no longer able to assist its citizens and eligible Afghans in accessing the airport.

“This is a painful moment because it means that despite all the great efforts of the past period, people who are eligible for evacuation to the Netherlands will be left behind,” the letter said. Those include Dutch citizens and Afghans who had worked with Dutch forces deployed as part of the U.S.-led coalition.

Poland, which has flown more than 900 Afghan citizens since the fall of Kabul, said it was also ending its evacuation program following decisions made by its allies, the U.S. and the U.K. “The situation is difficult, it is even dramatic, and more and more difficult with each hour,” Prime Minister Mateusz Morawiecki said Thursday.

The Italian Defense Ministry said its last flight would leave Kabul Thursday night. French Prime Minister Jean Castex told French radio RTL that the country would no longer be able to evacuate citizens after Friday. Danish Defense Minister Trine Bramsen said Wednesday that Denmark had already flown its last evacuation flight, and that it was no longer safe to fly in and out of Kabul. U.K. Defense Secretary Ben Wallace said in a broadcast interview that the country has 11 flights scheduled for Thursday but declined to say whether those would be the last, citing the need to protect troops on the ground.