N Korea mulls new nuclear test

North Korea could well be preparing to carry out a fourth nuclear test, South Korea said Tuesday, citing increased activity at its main test site just days ahead of a visit to Seoul by US President Barack Obama. "Our military is currently detecting a lot of activity in and around the Punggye-ri nuclear test site," defence ministry spokesman Kim Min-Seok told a press briefing. Kim stressed that North Korea's nuclear weapons programme was at a stage where it could conduct a test "at any moment" once the order was given by the leadership in Pyongyang. North Korea has conducted three nuclear tests -- in 2006, 2009 and 2013 -- all at the Punggye-ri site in the northeast of the country, according to AFP.