DECORAH, Iowa (AP) — A Secret Service agent on assignment in Iowa to help with presidential security has been arrested on suspicion of driving under the influence.

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City Police Chief Bill Nixon says 40-year-old Daniel L. Valencia was off duty when he was arrested Saturday in Decorah. President Barack Obama visited the northeast Iowa city on Monday as part of his three-day Midwestern bus trip.

Nixon says the arresting officer suspected Valencia had been drinking but that no vehicles were involved in an accident. He declined further comment Wednesday.

Secret Service spokesman George Ogilvee confirmed that Valencia is an agent and that the matter had been turned over to the agency's Office of Professional Responsibility. Ogilvee would not comment further.

Online court records don't list an attorney for Valencia.