WASHINGTON  — Three top officials of a nationwide cleaning service were charged Thursday with fraud and tax crimes as part of an ongoing federal investigation that also netted hundreds of illegal immigrants in 18 states.

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The illegal immigrants were working as janitors for Nevada-based Rosenbaum-Cunningham International, Inc., or RCI, a cleaning contractor for businesses.

The workers were swept up early Thursday in 63 locations nationwide, including restaurants such as the House of Blues, Hard Rock Cafe, ESPN Zone, Planet Hollywood, and others, according to a law enforcement official.

RCI co-owners Richard M. Rosenbaum and Edward Scott Cunningham, and firm controller Christina Flocken, face various criminal fraud, immigration and tax charges in the 23-count indictment unsealed in U.S. District Court in Grand Rapids, Mich.

The investigation, led by U.S. Immigration and Customs Enforcement, began 20 months ago from concerns about cleaning crews at the Grand Traverse Resort in western Michigan.

As many as 300 illegal immigrants working as janitors were caught up in the probe, according to the law enforcement official, who spoke on condition of anonymity because the charges had not yet been publicly announced.

A 1 p.m. EST news conference in Washington is planned.