From NBC's Pete Williams
Federal officials say a Washington, D.C.-area couple has been arrested and accused of spying for Cuba.
Officials say both are former U.S. government employees -- he from the State Department, she as a Congressional aide.
One official says the spying went on for more than two decades.
We expect to learn more details later today when a federal indictment is unsealed. For now, officials will not disclose the names or any other details.