The C-RAM defense system installed at the airport was committed to the rockets, the official said. There are currently no reports of any casualties.
C-RAM is an automated system that detects incoming attacks and uses a machine gun to destroy incoming fire before it can reach its target. The system has been used in Iraq and Afghanistan to intercept and destroy incoming projectiles aimed at U.S. forces.
Earlier Monday, Kabul residents said they had heard an explosion early in the morning, although there were no clear indications of the type of blast or any official confirmation of the source of the blast.
ISIS in Khorasan, known as ISIS-K, has claimed that an ISIS militant carried out the suicide attack, but did not provide any evidence to support the claim.
The US official said ISIS-K probably launched rockets aimed at the airport, but warned that it is too early to know for sure.
This is breaking news that will be updated.