You have missed few important parts: 1) It (supposedly) happened in March 2005, when world's (and US agencies') eyes were on Iraq war. 2) "<...> US authoritie

You have missed few important parts: 1) It (supposedly) happened in March 2005, when world's (and US agencies') eyes were on Iraq war. 2) "<...> US authorities admitted to their Indian counterparts the complete failure of their satellites to detect the blasts" Which is quite believable if nuclear blasts were low-yield as stated in the article.