Not long after Friday's shooting rampage at a Connecticut elementary school, media outlets began reporting the gunman's identity as 24-year-old Ryan Lanza of Hoboken, N.J.
His name and image quickly spread worldwide as the perpetrator of the nation's second-deadliest school shooting. Facebook and Twitter lit up as people vented their fury at the man they believed was responsible.
In reality, Ryan Lanza was at work in New York City when the gunman opened fire at Sandy Hook Elementary School in Newtown, Conn., some 60 miles away, and a law enforcement official later identified his 20-year-old brother, Adam Lanza, as the culprit.
Ryan Lanza was interviewed by investigators but is not believed to have any connection to the killings. He told officials he'd had no contact with his brother since 2010.
The Associated Press, relying on a law enforcement official who turned out to be mistaken, initially reported Ryan Lanza was the shooter. The official spoke on condition of anonymity because the source was not authorized to speak on the record about the developing investigation. Many other media outlets also reported the same, also citing law enforcement officials.
Once he realized he'd been identified as the perpetrator, Lanza evidently whipped out his mobile device and began posting a quick succession of denials on Facebook, according to screen grabs purportedly taken from his Facebook page and posted online.
"IT WASN'T ME I WAS AT WORK IT WASN'T ME," said one message. Then, two minutes later: "I'm on the bus home now it wasn't me." Finally, three minutes after that, he posted an obscenity and repeated, "it wasn't me," the screen grabs showed.