 A number of U.S. military bases in Europe are on heightened alert over possible terror attacks. It's not clear what exactly caused the alert to be raised to the second highest level, but European authorities have been tightening security ahead of the Paris Olympics and the ongoing European football championships. Millions of travelers are on the move ahead of the July 4th holiday. AAA predicts that a record 60 million people will be traveling by car. I'm Michael Kastner.