Three highly-trained sheriff's deputies were killed following an explosion at a training center in Los Angeles. The deputies were handling two "military grade explosives," according to sources familiar with the investigation, who say the explosion appears to be accidental. NBC News' Camila Bernal reports. In Maine, authorities charged a 17-year-old from Frankfort with the murder of 48-year-old Sunshine Stewart who was out on a pond paddleboarding earlier this month. NBC News' Erin McLaughlin reports. The Trump administration has secured the freedom of ten Americans it says were wrongly detained in Venezuela by the Maduro regime. Those Americans are now headed home. As part of the prisoner swap, a group of alleged Venezuelan gang members deported from the U.S. are now headed from El Salvador to Venezuela. NBC News' Kelly O'Donnell reports. 18-year-old Emma Marine is speaking out for the first time following a harrowing ordeal that was caught on camera. Police say the teenage store clerk fought back during an attempted kidnapping while she was at work. NBC News' Jesse Kirsch has the details from Florida. Stephen Colbert shocked his audience and late night fans, announcing CBS had decided to cancel his long-running show. "The Late Show" is the most-watched late night talk show on television, but it is expensive to produce and has faced declining ratings. Colbert has also been openly critical of President Trump, leading some to question whether the cancellation was politically motivated. NBC News' Chloe Melas reports. There is good news tonight in Seattle, where a pediatric dentist is embracing the responsibility of responding to thousands of kids in search of the tooth fairy. Dr. Purva Merchant's email, used to help her apply to dental school, has for years given parents and children alike a place to contact the tooth fairy. NBC News' Savannah Sellers spoke with Merchant who shared some of her favorite correspondence over the years. 

President Trump touted his administration's accomplishments as he marked six months in office on Sunday, as he continues to face backlash over the Justice Department's handling of the Epstein case files. NBC News' Yamiche Alcindor reports. An off-duty Border Patrol agent was shot in the face in New York City, in what two senior law enforcement sources say appears to be an attempted robbery, and a random encounter. Authorities say the suspect was subject to a deportation order. NBC News' Camila Bernal reports.  The number of people reported missing after catastrophic flooding in Kerr County, Texas, has dropped from a peak of more than 160 to three, officials said Saturday. NBC News' Ryan Chandler has the latest on the recovery, and the challenges ahead for people still searching for loved ones. A U.S.-backed ceasefire appeared to be holding in Syria on Sunday, after deadly violence rocked the region, when hundreds of people were killed in the city of Suwayda. The violence marks the biggest challenge yet to the new government in Damascus that toppled Bashar al-Assad in December. NBC News' Molly Hunter reports. The pilot of a Delta regional flight operated by SkyWest, flying from Minneapolis to Minot, North Dakota, said during an overhead announcement that he had to make an "aggressive maneuver" to avoid a mid-air collision with a military jet. NBC News' Maggie Vespa has the details. More than 60 million people were under heat alerts on Sunday, from Kansas to Florida. It comes as parts of the country saw dangerous flash flooding over the weekend. NBC News' Maya Eaglin has the latest. As cities across the country experiment with autonomous vehicles, West Palm Beach, Florida, has launched a program featuring autonomous shuttles. NBC News' George Solis has a closer look. After winning a contest earlier this year, Arlington, Virginia residents Katie Lettie and Vincent Bauer tied the knot at a wedding at the Arlington Public Library, with members of the community contributing to the special occasion. NBC News' Hallie Jackson has the story.