School shootings have taken a terrible human toll. They have also been a boon to the business of security technology.

Over the summer, Washington Post reporter John Woodrow Cox saw an array of items on display at an expo in Orlando, Fla. He and fellow reporter Steven Rich went on to investigate whether any of the technology being promoted and sold really helps save lives.

One minute, Seamus Hughes was reading the book Dragons Love Tacos to his son. A few minutes later, after putting him to bed, Hughes was back on his computer, stumbling on what could be one of the most closely guarded secrets within the U.S. government: that the Justice Department may be preparing criminal charges against WikiLeaks founder Julian Assange.

On the morning of his 23rd birthday, Leonel Salas is just getting off the fireline after battling the Woolsey fire all night in Southern California.

"[We] can't get any rest while we're on the lines," he says.

He's exhausted after working for 24 hours, but relieved to be at the base camp in Camarillo where there are hot meals, sleeping pods and mobile showers.

Salas and his crew have been on the job for over a week now. When he got the call to head out to the fire he didn't even have the chance to say goodbye to his parents.

Updated at 10:00 p.m. ET

President Trump visited fire-ravaged areas of California on Saturday, meeting with people affected by the wildfires. At least 76 people were killed in the Camp Fire in Northern California, and nearly 1,300 people have been reported missing, making it the most destructive and deadly wildfire in California state history.

Andrew Gillum ended his bid to become the first African-American governor of Florida on Saturday, conceding the race to his Republican rival, former Rep. Ron DeSantis.

"R.J. and I wanted to take a moment to congratulate Mr. DeSantis on becoming the next governor of the great state of Florida," Gillum said in a Facebook video with his wife at his side. "This has been the journey of our lives."

President Trump shot down reports on Saturday that his administration was considering extraditing a Pennsylvania-based foe of Turkish President Recep Tayyip Erdogan in order to diffuse tensions between Turkey and Saudi Arabia.

Erdogan says Fethullah Gulen, a Turkish cleric who has been living in Pennsylvania since the late 1990s, was involved in a failed coup in 2016. The government has requested the U.S. send him back to Turkey.

An Argentine submarine has been found about a half-mile below the ocean's surface, almost a year after it disappeared with 44 crew members on board.

Ocean Infinity, a Houston-based company, sent minisubmarines to scour the ocean floor for the submarine and were on the last day of their search when they received notification of a 197-foot-long geological formation in a deep ocean ravine, about 700 miles east of the Argentine city of Puerto Madryn. Photo images revealed it to be the submarine, the ARA San Juan.