State Department employee concealed 'extensive' contacts with Chinese intelligence agents, officials say

The employee received thousands of dollars in "gifts and benefits."

"When a public servant is suspected of potential misconduct or federal crimes that violate the public trust, we vigorously investigate such claims," acting State Department spokesperson Mark Toner told ABC News. "The Department of State is firmly committed to investigating and working with the Department of Justice and our other law enforcement partners to investigate any allegations of criminal activity and bring those who commit crimes to justice."

Claiborne started at the State Department in 1999 and was stationed all over the world, including multiple assignments in China. According to court documents, she first met two of the co-conspirators, whose names were not released, in 2011 and 2012 when she worked at the U.S. Embassy in Beijing.

She was arrested on March 28 and pleaded not guilty at a court appearance this afternoon. Court documents mention three co-conspirators in the case but their names were not released. One co-conspirator is described as an American citizen and two are described as Chinese citizens.

Another court hearing was set for April 18. Claiborne could face up to 25 years in prison if she is convicted of the charges of making false statements and obstructing an official proceeding.

This is a developing story. Please check back for updates.ABC News' Conor Finnegan contributed to this report.