ST. LOUIS • An employee of a privately run Missouri drivers license office in St. Louis County is among four people charged with helping undocumented aliens improperly obtain licenses or state identifications, officials said Tuesday.

An indictment unsealed in federal court Friday in St. Louis does not specify how the worker, Yvette Roberson, 59, of St. Louis County, or others benefited. She was arrested Monday.

The others indicted are Ricardo Ortiz, 31, of Montgomery City; Jorge Fabian Pequeda Perez, 35, of St. Peters; and Elizabeth Cervantes, 27, of St. Peters. Ortiz is also known as Jose Ramos Jr.

Ortiz and Roberson are charged with conspiracy and production of false identifications; Perez with conspiracy and illegal possession of 15 or more access devices; and Cervantes with possession of false identification documents.

Roberson's lawyer, Lenny Kagan, declined to comment, saying, "It's too premature." Lawyers for the others could not be reached.

Roberson was hired at a privately run revenue office in St. Louis County in 2007, the indictment says. From March 2010 through Jan. 31, 2012, Ortiz and Perez allegedly provided undocumented immigrants with stolen or bogus identification documents, and they gave them to Roberson. She then issued drivers licenses without a test, or nondriver IDs, the indictment says.

Roberson's office location and the number of people receiving IDs were not specified, but Perez was accused of having more than 20 Social Security numbers belonging to others.

Roberson was fired from the Creve Coeur drivers license fee office in 2010 after making "excessive errors," the manager, Lisa Ottenberg, said Tuesday. She said the "final straw" was a verbal confrontation with a customer.

Roberson then moved to the Bridgeton office, Ottenberg said. No one answered repeated calls to that office Tuesday. The president of the company that holds its license, Mark S. Miles, referred a reporter to the Missouri Department of Revenue.

Ted Farnen, spokesman for that agency, said Roberson was fired last week. He said the department was "heavily involved in this investigation," but he declined to comment on how many licenses might be involved.

Last month, a federal grand jury in Kansas City indicted 14, alleging that a conspiracy in a fee license office in St. Joseph, Mo., provided more than 3,500 fraudulent identity papers to undocumented immigrants across the country.

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EDITOR'S NOTE: An earlier version of this story gave an incorrect year for Roberson's firing from a license office in Creve Coeur. This version has been updated.