Eileen Wang, the 58-year-old mayor of Arcadia, California, resigned from office Monday after the U.S. Department of Justice announced she had been charged with acting as an illegal foreign agent of China.

Wang agreed to plead guilty to the felony count, which carries a potential sentence of up to 10 years in prison. The charges were announced by federal prosecutors on Monday, the same day as her resignation.

Arcadia is a city in the Los Angeles area with a population of approximately 57,000 residents. Wang's resignation was described as sudden by multiple sources familiar with the matter.

The Department of Justice has not released additional details about the specific activities that led to the charges or the timeline of Wang's alleged work as a foreign agent. The case represents another instance of federal authorities pursuing charges related to undisclosed foreign influence operations.

The guilty plea agreement suggests Wang is cooperating with federal authorities, though the terms of any cooperation have not been disclosed. A sentencing date has not been announced.