In a televised speech Thursday evening, President Joe Biden said US military is in the process of developing "operational plans to strike IS leadership, assets and facilities," following a bombing outside Kabul airport that killed 13 US service members, along with at least 90 Afghan civilians.
The Islamic State's Afghanistan affiliate, known as IS-K claimed responsibility for the attack.
"We will not be deterred by terrorists. We will not let them stop our mission," Biden told reporters. "We will continue the evacuation."
"We will not forgive. We will not forget. We will hunt you down and make you pay," Biden said, referring to those responsible.
The president said there was no evidence that IS-K colluded with the Taliban to carry out the attack.
President Biden also said US forces would continue evacuation of US citizens and Afghan allies and would meet the August 31 pullout deadline.
He defended his decision to end the US combat mission in the country: "It was time to end a 20-year war."