WASHINGTON, Nov 5 (INP) The only way to locate and secure all of North Korea’s nuclear weapons sites “with complete certainty” is through an invasion of ground forces, and in the event of conflict, Pyongyang could use biological and chemical weapons, the Pentagon told lawmakers in a new, blunt assessment of what war on the Korean Peninsula might look like. The Pentagon, in a letter to lawmakers, said that a full discussion of U.S. capabilities to “counter North Korea’s ability to respond with a nuclear weapon and to eliminate North Korea’s nuclear weapons located in deeply buried, underground facilities” is best suited for a classified briefing. INP/AH