11.   In a related matter, Secretary of Energy Bill Richardson said on Tuesday that he had accepted recommendations for tightening security at Los Alamos and other weapons labs.

12.   In Washington Tuesday, Energy Department secretary Bill Richardson announced new initiatives to guard the weapons labs against espionage.

13.   It has also faced relentless opposition from U.S. weapons labs.

14.   It pointed to an extensive intelligence leak at American weapons labs.

15.   It temporarily bars foreign visitors from the weapons labs and tightens access to classified information by Energy Department employees.

16.   Last week, President Clinton said his administration had promptly addressed the security problems at the weapons labs.

17.   Lee was fired from his job at the weapons lab in March.

18.   More than a half-dozen congressional committees are examining both evidence of Chinese nuclear spying and security failures at Los Alamos and other weapons labs.

19.   More recently, the weapons labs have been developing computer simulation models and experimenting with subcritical mini-explosions to maintain the stockpile.

20.   Now, at the end of the Cold War, the Chinese seemed to have succeeded in penetrating the same weapons lab.