New Delhi, Sept. 6 -- Some of the highest-ranking officers in the US military were subjected to polygraph tests as the Pentagon launched an unusually broad hunt for the source of sensitive leaks concerning America's stockpiles of advanced weapons.

Several dozen senior military officials underwent the tests earlier this summer after classified details about the country's supplies of sophisticated munitions appeared in media reports, according to US officials briefed on the investigation. The scale of the inquiry was highly unusual.

Polygraph examinations are not uncommon for senior military and civilian officials with access to classified material. But officials told CBS News that the number of people pulled into the latest investigation...