Ayatollah Ali Khamenei strongly rejected proposals for direct talks with United States, apparently quashing suggestions for a breakthrough dialogue on the nuclear standoff and potentially other issues.

Discussed 'further consequences' should nation conduct nuke test.

Move comes amid signs N. Korea will soon carry out nuke test.

Authorities had outlawed leftist group under surveillance.

Welcomed willingness to hold direct talks in standoff.

State-run media identified bomber as a member of an outlawed political group, which has claimed responsibility for assassinations and bombings since the 1970s.

Groundbreaking move recommended by Joint Chiefs overturns 1994 rule.