The US has a long-standing defence relationship with Kuwait, and more than 13,000 American soldiers are stationed in the Gulf nation.
Iran has responded to attacks against it by launching missiles at Gulf countries allied with the US. Bahrain, UAE, Saudi Arabia, Oman and Qatar have all also seen strikes.
Separately in Kuwait, the US confirmed three fighter jets were downed after what it described as an incident of “friendly fire” on Monday.
Footage showed the jets spiralling to the ground. The pilots involved all managed to eject and survived the incident.
Iran state media claimed the Iranian military had shot down the jets, without providing evidence.