Sandy Hook Elementary was one of the deadliest school shootings in U.S. history. Shortly after the tragedy, the National Rifle Association funded a study to review school security.
The man who led that review is former Congressman and Drug Enforcement Administrator Asa Hutchinson.
He's recommended armed guard as part of the solution to keep school safer.
But is this a viable solution?
Newly-released 911 calls reveal the chilling scene at Sandy Hook Elementary last December just moments after 20-year-old Adam Lanza walked into the school and went on a massive killing spree.
Newtown school shooting 911 calls released
Lanza killed 20 children and six faculty members before turning the gun on himself.
CNN's Deborah Feyerick has the latest.
A source tells CNN a stolen vehicle in Mexico that was packed with dangerous radioactive materials has been found.
Officials say the container holding the chemical agent, known as cobalt-60, was found opened. A special team is now being deployed to the area.
CNN's Brian Todd has the latest.
It's another house of horrors, this time in Tucson, Arizona.
According to police, three girls, ages 12, 13, and 17, were kept locked in their bedrooms by their mother and step-father, forced to live in filthy conditions for as long as two years.
Both parents were arrested yesterday after two of the sisters escaped and ran to a neighbor who called police.
Paul Vercammen is Outfront.
A 17-year-old who spent three years in jail for beheading four boys in Mexico is now said to be living in San Antonio.
There are growing concerns about whether he may strike again.
Ed Lavandera is OutFront.