The government is re-evaluating two decades worth of intelligence obtained from Cuba after discovering that many sources were double agents working for the Communist government there, a congressman said Saturday.

"A large number of our intelligence activities (in Cuba) involved individuals who apparently were double agents over the past 20 years," U.S. Rep. Dan Mica, chairman of the House International Operations Subcommittee, told The Associated Press in an interview."There is great concern."

Mica said the government also is investigating romantic encounters between Marine guards at the U.S. Interests Section in Havana and Cuban women, but he added that guards probably didn't betray U.S. secrets.

The congressman also disclosed that an investigation of U.S. embassies in other East bloc countries indicated there may have been as many as 500 attempts to use women to entice Marine guards into compromising security.

Mica said a Cuban defector raised the claims that U.S. intelligence in Cuba had been undermined. He declined to identify the defector or give other details.

"As we were starting to check it, the scope just became astounding," Mica said. "There is now in process a major review of what did we get the last 20 years, who did we get it from, what did we do with it, did it have an effect on foreign policy, did we advise our military and our allies improperly."

Mica said the Central Intelligence Agency, the Naval Investigative Service, State Department intelligence and the General Accounting Office have been investigating Cuban intelligence for several months.

"We're still trying to assess the damage," Mica said.