UAE media reported that the Emirati man was detained in Avon, Ohio, last week after a female clerk at a local hotel called 911 to report what she had described as a man affiliated to Islamic State, according to the Arabic-language al-Bayan newspaper.
The English language The National said the receptionist at the Fairfield Inn hotel called the police after she heard the man talking on his phone in the hotel lobby.
Gulf News, another UAE newspaper, published photos of the Emirati man in white robes being wrestled to the ground and handcuffed before being led away by police.
In a message on a Foreign Ministry Twitter account aimed at citizens traveling abroad, the ministry said on Saturday:
"For citizens traveling outside the country, and in order to ensure their safety, we point out not to wear formal dress while traveling, especially in public places," the message dated July 2 stated, without referring to the Avon incident.
The foreign ministry said in a statement it had summoned U.S. deputy ambassador Ethan Goldrich to protest the "abusive treatment by the Ohio police of a UAE citizen" and to deplore the filming of his arrest which it described as defamation.
"The UAE cares for the safety of its citizens and demands clarifications about the incident," it said in a statement carried by WAM state news agency.
Goldrich "apologized" for the incident, pledging to seek clarifications from authorities in the state of Ohio, WAM said.
Local newspapers said Avon police released the man after they realized their mistake, but he fainted and needed hospital treatment. The 41-year-old, identified as Ahmed al-Menhali, was visiting the United States for medical treatment, The National said.
Al-Bayan reported that the man had hired a lawyer to pursue the case, saying he had received no apology from either the police or the hotel.