The FBI was raiding a home in New Orleans on Monday in connection with a spy investigation of U.S. military secrets being illegally given to China.

A Defense Department analyst with security clearances was among the three or four people being charged in what law enforcement officials described as separate cases in the states of Virginia and California.

It was not immediately clear how the New Orleans raid was related, but FBI spokeswoman Sheila Thorne said the case would be discussed at a news conference addressing the espionage cases that was planned at the Justice Department in Washington.

Officials said a Los Angeles-area Chinese national who worked for a technology company until 2006 also would be charged for passing on sensitive military data to the Chinese government.