North Korea appears to be pressing ahead with its nuclear programme. Satellite images recently detected hectic activity at the North Korean nuclear test site, Punggye-ri. Experts say that after North Korea's last nuclear test, minor tremors were detected near Mt Mantap, located close to the nuclear site. However, Pyongyang is now engaged in additional tunnel work at the site. According to experts at 38North, a US-based think tank, the fresh activities were detected at the West Portal of the site – indicating that the site may be undergoing an expansion. Meanwhile, the North Portal, where the previous five tests were...