File picture shows the inside of the Russian-built Bushehr nuclear power plant in southern Iran. US intelligence agencies have significantly stepped up spying operations on Iran's Bushehr nuclear ... more 

File picture shows the inside of the Russian-built Bushehr nuclear power plant in southern Iran. US intelligence agencies have significantly stepped up spying operations on Iran's Bushehr nuclear reactor prompted by concerns about the security of weapons-grade plutonium there, The Wall Street Journal reported Monday less