appear they have backe no but t knows they are still a major threat. >> reporter: yes, david. it does appear kim jong-un blinked and backed away in what could have resulted in a major military conflict, but this does not in any way end the threat from this volatile dictar. we know intelligence believes he is trying to perfect a nuclear weapon that could reach the u.s., and as the general told me, military options must remain on the table, david. >> reporting in from seoul again tonight, thank you, martha. back at home to the invisible danger. this time in new jersey, nearly a dozen people hospitalized by dangerous levels of carbon monoxide. a father coming home to discover his entire family unconscious. police and neighbors overcome after rushing inside to help, and here's abc's mara schiavocampo. >> reporter: tonight, 11 people recovering after being trapped inside this new jersey home, poisoned by a carbon monoxide leak. officials saying they were discovered moments before it was too late. >> five people unconscious.