VIENNA, Austria (AP) _ Police have detained a man of Arab origin suspected of planning an attack against the U.S. Embassy in Vienna, an Interior Ministry spokesman said Monday.

The man, whose identity was not revealed, was taken into police custody Feb. 10, said the spokesman, Rudolf Gollia. The suspect remained in custody on Monday, as police continued their investigation, Gollia said.

The U.S. Embassy was closed last Wednesday in response to a suspected threat, an embassy employee familiar with security measures said while speaking on condition of anonymity.

Officials from the embassy were unavailable for comment Monday because of the holiday.

Police in Austria say they placed the man in investigative custody after receiving evidence that he might have been linked to a purported attack, but declined to say what type of information they received.

Since the Feb. 10 arrest, however, police have uncovered no evidence that the suspect was involved in any embassy plot.

``It's now becoming clearer that he did not intend to attack the embassy,'' Gollia said. ``He seems to be innocent.''

The threat marks the second scare in recent months involving a U.S. installation in Austria.

An anonymous bomb threat was directed against Vienna's Marriott hotel, which is located in the same building as the U.S. Consulate.

That Oct. 14 threat turned out to be fake.