Customs agents detained seven people, mostly Syrian nationals, after they disembarked a Royal Caribbean cruise at Port Canaveral Sunday morning, according to a volunteer attorney with the American Civil Liberties Union.

Customs agents escorted the seven individuals into a room where they were held for 6 ½ hours before being released, the attorney said.

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One of those detained was a Jewish refugee from Syria who has resided in the country for 20 years and her three children, who are U.S. citizens, the attorney said.

A spokesman for U.S. Customs was not immediately available for comment.

A spokeswoman for Royal Caribbean was not immediately available for comment as to whether it has issued travel notices to those who have booked cruises.