The ministry yesterday said in a statement that a hand-written note had been found in which the driver, 28-year old Ibrahim Sulaiman, had pledged allegiance to the Islamic State jihadist group.
The statement said the man deliberately rammed the truck into the vehicle carrying the Americans yesterday in an attempt to kill them, based on initial interrogation of Sulaiman who was hospitalised after he was injured in the incident.
The Americans escaped unhurt. It was not immediately clear where the incident took place.
The statement did not identify the US nationals or say whether they were among the thousands of US troops stationed in the oil-rich Gulf state.
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Pictures distributed by the ministry showed the Americans were traveling in a small civilian truck.
The ministry said authorities would launch an investigation to uncover whether or not the driver had any accomplices.
Kuwaiti authorities announced in July they had dismantled three IS cells plotting attacks, including a suicide bombing against a Shiite mosque and against an interior ministry target.
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