A sampling of the documents showed that the newly published cables included the names of some people who had spoken confidentially to American diplomats and whose identities were marked in the cables with the warning “strictly protect.”

State Department officials and human rights activists have been concerned that such diplomatic sources, including activists, journalists and academics in authoritarian countries, could face reprisals, including dismissal from their jobs, prosecution or violence…

Government officials and journalists were poring over the newly released cables on Monday to assess whether people named in them might face repercussions. A quick sampling found at least one cable posted on Monday, from the American Embassy in Australia, had a name removed, but several others left in the identities of people whom diplomats had flagged for protection.