Kabul: After US President Joe Biden vowed to hunt down Kabul blasts attackers, US military forces conducted an over-the-horizon counterterrorism operation today against an ISIS-K planner in the Nangarhar Province of Afghanistan.

Pentagon issued US Central Command statement on counterterrorism said, "Initial indications are that we killed the target. We know of no civilian casualties".

Al Jazeera, quoting an official on the condition of anonymity, reported that a Reaper drone, which took off from the Middle East, reportedly struck target while he was in a car with another associate.

Read: Kabul twin blasts: Death toll rises to 110, evacuation resumes

The White House said the next few days are likely to be the most dangerous.

“We certainly are prepared and would expect future attempts,” Pentagon spokesman John Kirby told reporters in Washington. “We’re monitoring these threats, very, very specifically, virtually in real time.”

In deadly twin blasts a week after the Taliban takeover of Afghanistan, at least 110 people, including 12 US service members, were killed outside Kabul airport. As per reports, Islamic State Khorasan (ISIS-K) claimed responsibility for the deadly double attack at Kabul airport on the group's Telegram account.

The casualties are the worst single-day loss for American troops in Afghanistan since the August 2011 attack on a Chinook helicopter that killed 30 service members. The US flag will be flown at half-mast until the evening of August 30 to honour the victims killed in attacks.