WASHINGTON (CNN) -- The United States is expelling three Cuban diplomats suspected of spying. They have been ordered to leave the country for activities "incompatible" with their diplomatic mission at the United Nations, the White House said Wednesday.

"The action is based on a long exhaustive investigation by U.S. law enforcement authorities," said National Security Council spokesman P.J. Crowley. He did not provide details.

A U.S. diplomatic source in New York said the three Cuban diplomats were given until Monday to leave the United States. The source said the diplomats were Eduardo Martinez Borbonet, a first secretary; Roberto Azanza Paez, a third secretary; and Gonzalo Fernandez Garay, an attache.

The Cuban government, which was notified of the expulsion plans earlier in the week, had not responded publicly as of Wednesday morning.

While the circumstances of the alleged espionage were unknown, the issue was tied to the arrest of 10 people in Miami in September, according to reports in the Washington Post and El Nuevo Herald, a Spanish language newspaper published by The Miami Herald.

Those arrested were accused of collecting information on U.S. military installations and of attempting to infiltrate an anti-Castro group in Florida.

Rep. Lincoln Diaz-Balart, R-Florida, said the State Department told him Tuesday about the expulsions.

"Quite frankly, the news didn't surprise me. All of (Cuban President Fidel) Castro's diplomats are spies," he told El Nuevo Herald.

While the United States does not maintain full diplomatic relations with Cuba, the Caribbean island's U.N. diplomats are permitted to live in New York for the purposes of U.N. activities. However, severe restrictions are placed on their movements, including their ability to go outside New York City.

Reuters contributed to this report.