WASHINGTON — The bizarre rumors began with a leaked email referring to Hillary Clinton and sinister interpretations of pizza parties. It morphed into fake online news stories about a child sex trafficking ring run by prominent Democrats operating out of a Washington, D.C., restaurant.

On Sunday, it culminated in violence when police say a North Carolina man fired an assault rifle inside the Comet Ping Pong restaurant as he attempted to “self-investigate” the conspiracy theory known in the Twitterverse as “Pizzagate.”

No one was hurt and the man was arrested. But the shooting alarmed those from neighboring businesses all the way to the White House about the real life dangers of fake news on the internet. One of those people posting on the conspiracy theory is the son of President-elect Donald Trump’s proposed national security adviser.

On Monday, White House Spokesman Josh Earnest, asked about the shooting, said, “There’s no denying the corrosive effect that some of these false reports have had on our political debate, and that’s concerning in a political context. It’s deeply troubling that some of those false reports could lead to violence.”