Temperature sensors and signs of breathing were detected Thursday by a sniffer dog that signaled there may still be survivors buried in rubble, says a volunteer. WATCH THE FULL EPISODE OF 'WORLD NEWS TONIGHT': https://bit.ly/31TZgUh WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT: http://abc.go.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://hulu.tv/33iKepm #WorldNewsTonight #Beirut #BeirutExplosion