To date, 12 U.S. Marines were reported among dozens of victims of terror attacks at the Kabul airport. Biden was scheduled to meet with Bennett late Thursday morning, but the meeting was postponed due to the emergency.

By Associated Press 

Two suicide bombers and gunmen attacked crowds of Afghans flocking to Kabul’s airport Thursday, transforming a scene of desperation into one of horror in the waning days of an airlift for those fleeing the Taliban takeover. At least 13 people were killed and 15 wounded, Russian officials said.

One of the bombers struck people standing knee-deep in a wastewater canal under the sweltering sun, throwing bodies into the fetid water. Those who moments earlier had hoped to get on flights out could be seen carrying the wounded to ambulances in a daze, their own clothes darkened with blood.

A U.S. official said the complex attack was believed to have been carried out by the Islamic State group. The IS affiliate in Afghanistan is far more radical than the Taliban, who recently took control of the country in a lightning blitz and condemned the attack.

A source told Fox News that there are hundreds of Islamic States fighters in the vicinity and warned that attacks are “likely to continue.”

Western officials had warned of a major attack, urging people to leave the airport, but that advice went largely unheeded by Afghans desperate to escape the country in the last few days of an American-led evacuation before the U.S. officially ends its 20-year presence on Aug. 31.

At least 13 people died and 15 were wounded, according to Russia’s Foreign Ministry, which gave the first official casualty count.

Adam Khan was waiting nearby when he saw the first explosion outside what’s known as the Abbey gate. He said several people appeared to have been killed or wounded, including some who were maimed.

The second blast was at or near Baron Hotel, where many people, including Afghans, Britons and Americans, were told to gather in recent days before heading to the airport for evacuation.

A former Royal Marine who runs an animal shelter in Afghanistan says he and his staff were caught up in the aftermath of the blast near the airport.

“All of a sudden we heard gunshots and our vehicle was targeted, had our driver not turned around he would have been shot in the head by a man with an AK-47,” Paul “Pen” Farthing told Britain’s Press Association news agency.

Farthing is trying to get staff of his Nowzad charity out of Afghanistan, along with the group’s rescued animals.

He is among thousands trying to flee. Over the last week, the airport has been the scene of some of the most searing images of the chaotic end of America’s longest war and the Taliban’s takeover, as flight after flight took off carrying those who fear a return to the terrorists’ brutal rule. When the Taliban were last in power, they confined women largely to their home and widely imposed draconian restrictions.

Already, some countries have ended their evacuations and begun to withdraw their soldiers and diplomats, signaling the beginning of the end of one of history’s largest airlifts. The Taliban have insisted foreign troops must be out by Aug. 31 — and the evacuations must end then, too.

In Washington, U.S. President Joe Biden spent much of the morning in the secure White House Situation Room where he was briefed on the explosions and conferred with his national security team and commanders on the ground in Kabul.

Biden was scheduled to meet with Israeli Prime Minister Naftali Bennett late Thursday morning. The meeting has been postponed until Friday due to the attacks.

“On behalf of the people of Israel, I share our deep sadness over the loss of American lives in Kabul. Israel stands with the United States in these difficult times, just as America has always stood with us. Our thoughts and prayers are with the people of the United States,” Bennett stated.

Overnight, warnings emerged from Western capitals about a threat from IS, which has seen its ranks boosted by the Taliban’s freeing of prisoners during its advance through Afghanistan.

Late Wednesday, the U.S. Embassy warned citizens at three airport gates to leave immediately due to an unspecified security threat. Australia, Britain and New Zealand also advised their citizens Thursday not to go to the airport.

Taliban spokesman Zabihullah Mujahid denied that any attack was imminent at the airport, where the group’s fighters have deployed and occasionally used heavy-handed tactics to control the crowds. After the attack, he appeared to shirk blame, noting the airport is controlled by U.S. troops.

Before the blast, the Taliban sprayed a water cannon at those gathered at one airport gate to try to drive the crowd away, as someone launched tear gas canisters elsewhere.

World Israel News contributed to this report.