Two Americans were among four people who were killed on Monday in a suspected terrorist attack in Tajikistan, ABC News reported.

Tajikistan’s interior minister said a car struck a group of seven cyclists who were traveling in the country’s Danghara district, southeast of the capital. Five people inside the car then got out and attacked them with a knife and a firearm.

An Islamic State in Iraq and Syria-affiliated group later took responsibility for the attack on Twitter, ABC reported.

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However, authorities told ABC that they had not officially ruled out armed robbery as the motive for the attack.

In addition to the two Americans — one woman and one man — a Swiss man and a Dutch national were also reportedly killed. The three other cyclists were injured.

The U.S. Embassy in Tajikistan issued a statement early Monday saying it condemns the “cruelty of the attackers and recognize that they in no way represent the kindness and hospitality of the Tajik people.”

The embassy has allegedly sent its condolences to Americans' families, and says there is "no evidence that indicates a heightened level of threat to U.S. citizens."

A State Department official said it was not yet identifying the victims, and referred questions on the incident to local authorities.

Tajikistan declared 2018 a "year of tourism," ABC noted, adding officials have been cautious about labeling the incident as terrorist activity.

If authorities confirm the incident as an act of terrorism, it would be the first time Americans have been killed in a terrorist attack since a van plowed into a crowd in Barcelona in August 2017.