New research from the Centers for Disease Control and Prevention shows the annual US HIV diagnosis rate has decreased over 30% from 2002-2011. Also, a new study found most genetic risk for autism comes from common versions of genes, not rare mutations. David Begnaud has the day’s top health stories. Source

A state of emergency left Miami Beach streets clear of people by 11 p.m. Saturday night. But hours earlier, thousands were there, singing and dancing, leading officials to declare a curfew. CBS Miami’s Bobeth Yates reports. Source

One of the people killed was a police officer, and a person of interest is in custody. Source

The downing of Malaysia Airlines Flight 17 has strained an already tense relationship between the U.S. and Russia. Former CIA deputy director Mike Morrell joins “CBS This Morning: Saturday” to discuss the diplomatic implications. Source

Family and friends of the 44 Malaysians who were on Flight 17 flock to the Kuala Lumpur International Airport in search of information. Seth Doane reports. Source

CBS travel editor Peter Greenberg discusses what could have been done to prevent the tragic outcome of flight MH17. Source

Recovery teams are attempting to remove the bodies of MH17 victims, but local separatist rebels are making matters more difficult. Mark Phillips reports. Source

Writer/director Mike Cahill first brought audiences the science fiction-drama “Another Earth” and in his second feature, “I Origins” starring Brit Marling, he continues to explore the relationship between science and spirituality. Jericka Duncan has a preview. Source

Michael K. Williams, Frank Grillo, Carmen Ejogo and writer/director James DeMonaco spoke to CBS News’ Ken Lombardi about their new sequel, “The Purge: Anarchy,” set in an America where, for one night out of the year, all crime, including murder, is legal. Some of the stars said that the film is a reflection of today’s gun violence. Source

Nick Dietz compiles some of the week’s best viral videos, including a luxury ad for a not-so-luxurious car, a giant anchovy aggregation and a puppy comforting an older dog during a bad dream. Plus, Scott Cleveland shaves for his grandmother’s centennial. To see these videos in their entirety, click HERE. Source