Two civil rights groups have filed a federal lawsuit alleging immigration enforcement violations by the Frederick County Sheriff's Office.

New York-based LatinoJustice PRLDEF and the state organization Casa de Maryland filed the complaint Tuesday in U.S. District Court in Greenbelt.

It alleges that two Frederick County deputies interrogated a Salvadoran immigrant about her immigration status while she was eating lunch outdoors in Frederick, and then took her into custody and transferred her to federal immigration authorities.

The complaint contends the incident violated an agreement allowing local police to question the immigration status only of people they have arrested for other offenses.

Sheriff Chuck Jenkins says the complaint left out some facts, and that he is looking into the matter.