In the wake of a grand jury decision not to indict Officer Darren Wilson in the shooting death of Michael Brown, Americans have grown accustomed to images of police and protesters in Ferguson, Missouri. One such image is now going viral, but not for the reason one might think. The photo ... shows 12-year-old Devonte Hart and Portland Police Sgt. Bret Barnum embraced in a hug outside of a Ferguson rally on Tuesday. Hart's mother ... explained that she and Hart went to downtown Portland with the intention of spreading love and kindness." Hart brandished a "Free Hugs" sign as he stood alone in front of a police barricade. His mother says he started to get emotional during the rally: "He wonders if someday when he no longer wears a 'Free Hugs' sign around his neck, when he's a full-grown black male, if his life will be in danger for simply being." That's when Sgt. Barnum noticed Hart crying and called the boy over to him. Barnum ... asked why he was crying. Hart's mother says his response was "about his concerns regarding the level of police brutality towards young black kids was met with an unexpected: "Yes. I know. I'm sorry. I'm sorry." Next, Sgt Barnum asked if he could have one of the "Free Hugs" advertised on his sign. Barnum [said] "it's a blessing for me that I didn't miss an opportunity to impact this child." The image has now been shared widely across social media. Hart's mother called the tearful hug "one of the most emotionally charged experiences I've had as a mother."