President Joe Biden vowed on Thursday to complete the evacuation of American citizens and others from Afghanistan despite a deadly suicide bomb attack at the Kabul airport. He also promised to avenge the deaths, declaring to the extremists responsible: "We will hunt you down and make you pay."

Speaking with emotion from the White House, Biden said the Islamic State group's Afghanistan affiliate was to blame for the attacks that killed 12 American service members and many more Afghan civilians. He said there was no evidence they colluded with the Taliban, who now control the country.

"We have some reason to believe we know who they are," he said of the bombers and gunmen involved. "Not certain."

As many as 1,000 Americans and many more Afghans are still struggling to get out of Kabul.

Biden was briefed on the attacks, which also killed dozens of Afghans and came 12 days into the rushed evacuation and five days before its scheduled completion. Some Republicans argued to extend the evacuation beyond next Tuesday's deadline.

In pics | Kabul airport blasts rock Afghanistan

The US general overseeing the evacuation, General Frank McKenzie, said after the attacks, "If we can find who is associated with this, we will go after them." He said it would be a mistake for the United States to call an early end to the evacuation, despite the risks.

The administration has been widely blamed for a chaotic and deadly evacuation that began in earnest only after the collapse of the US-backed Afghan government and the Taliban's takeover of the country. More than 100,000 people have been evacuated so far.

Thursday's attacks were sure to intensify political pressure from all sides on Biden, who already was under heavy criticism for not beginning the pullout earlier. He had announced in April that he was ending the US war and would have all forces out by September.

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House Republican leader Kevin McCarthy of California called for Speaker Nancy Pelosi, D-California, to bring the chamber back into session to consider legislation that would prohibit the US withdrawal until all Americans are out. That's highly unlikely, and Pelosi's office dismissed such suggestions as empty stunts.

At the Pentagon, Gen McKenzie said the military believes the attacks on the airport's perimeter were carried out by fighters affiliated with the Islamic State group's Afghanistan arm. He said more attempted attacks were expected.

After the suicide bomber's attack at the airport's Abbey Gate, a number of ISIS gunmen opened fire on civilians and military forces, he said. There also was an attack at or near the Baron Hotel near that gate, he said.

The attacks won't drive the US out earlier than scheduled, he said.

"Let me be clear, while we are saddened by the loss of life, both the US and Afghan, we are continuing to execute the mission," he said. He said there were about 5,000 evacuees on the airfield on Thursday awaiting flights. He said the Taliban have been useful to work with and are not suspected in the attacks.

"We thought this would happen sooner or later," McKenzie said, adding that the US military commanders were working with Taliban commanders to prevent further attacks.

McKenzie said that in addition to the 12 US service members killed in the attacks, at least 15 were injured.

As details of the attacks emerged, the White House rescheduled Biden's first in-person meeting with Israel's new prime minister and canceled a video conference with governors about Afghan refugees arriving in the United States.

Biden had pledged to get out of Afghanistan every American who wished to leave. As of Thursday, the State Department estimated there were as many as 1,000 Americans in Afghanistan who may want help getting out.

Biden on Thursday had been scheduled to host Israeli leader Naftali Bennett, who is on his first visit to the United States since taking office. The meeting was rescheduled for Friday. Biden cancelled plans to meet virtually with a bipartisan group of governors who have said they want to help resettle Afghan refugees.

A number of US allies said they were ending their evacuation efforts in Kabul, at least in part to give the US the time it needs to wrap up its evacuation operations before getting more than 5,000 US troops out by Tuesday.

Despite intense pressure to extend the Tuesday deadline, Biden has repeatedly cited the threat of terrorist attacks against civilians and US service members as a reason to keep to his plan.

The explosions detonated as the US worked to get the remaining Americans out of the country. Secretary of State Antony Blinken said on Wednesday that as many as 1,500 Americans may be awaiting evacuation.

Asked during an interview with ABC News about reports the evacuation could end on Friday, Ross Wilson, the US ambassador to Afghanistan, declined to comment. He spoke shortly before the deadly attacks.

Wilson said there are safe ways to get to the airport for those Americans who still want to leave. He added that there undoubtedly will be some at-risk Afghans who will not get out before Biden's deadline.

The airlift continued on Thursday despite warnings of vehicle-borne bomb threats near the airport. The White House said 13,400 people had been evacuated in the 24 hours that ended early on Thursday morning Washington time. Those included 5,100 people aboard US military planes and 8,300 on coalition and partner aircraft. That was a substantial drop from the 19,000 airlifted by all means the day before.

First Published:Aug 27, 2021 9:57 AM IST