The U.S. has struck back strike against an ISIS-K planner, about 48 hours after a deadly suicide attack killed 13 Americans and about 170 Afghans, U.S. Central Command (CENTCOM) said in a statement Friday.

CENTCOM said the drone strike targeted an Islamic State member in Nangahar believed to be involved in planning the attacks against the U.S. in Kabul. 

“U.S. military forces conducted an over-the-horizon counterterrorism operation today against an ISIS-K planner. The unmanned airstrike occurred in the Nangarhar Province of Afghanistan,” spokesman Capt. Bill Urban said.

“Initial indications are that we killed the target. We know of no civilian casualties,” Urban continued.

Unnamed Pentagon officials said the strike was authorized by President Biden and ordered by Defense Secretary Lloyd Austin.

CENTCOM’s statement came a day after President Joe Biden vowed to retaliate for the terrorist attack outside Kabul’s international airport even as he said the frantic mission to airlift Americans from Afghanistan would continue. 

“We will not forgive. We will not forget. We will hunt you down and make you pay,” the President said from the White House on Thursday.

ISIS in Khorasan, known as ISIS-K, has claimed that one of its militants carried out Thursday’s suicide attack. Although the group has provided no evidence to support the claim, American officials have corroborated it.