June 28: Summer travel troubles across U.S. New round of record-breaking heat. NASCAR driver family tragedy. Spotlight on tourists behaving badly.

<p>Flight cancelations and delays growing ahead of the summer’s busiest travel weekend. Also, severe weather impacting millions of Americans across the country. Plus, NASCAR star Jimmie Johnson’s in-laws and young nephew found dead in an apparent murder-suicide. And, police in Italy searching for the man who defaced the ancient Colosseum. </p>