On Monday, at London’s Tate Modern museum, a teenager did the unthinkable: allegedly — while crowds enjoyed the exhibits — he threw a 6-year-old from a 10th-floor viewing gallery.

The adolescent was subsequently restrained by guests. Witness Nancy Barnfield told The Associated Press he “just stood there and was quite calm.”

Miraculously, the little boy survived: He landed on a fifth-floor roof.

The child is currently in critical but stable condition.

Nancy recounted a “loud bang” followed by a woman screaming, “Where’s my son?! Where’s my son?!”

The 17-year-old is in custody on suspicion of attempted murder.

Police are still trying to determine a motive; they don’t believe the two knew one another.

Detective Chief Superintendent John Massey of the Metropolitan Police marveled over the evil deed:

“This was a truly shocking incident, and people will understandably be searching for answers. At the moment, this is being treated as an isolated event with no distinct or apparent motive.”

Law enforcement is looking to speak with anyone who “witnessed a male whose behavior seemed out of place, suspicious or worrying, in the hour or two before the incident in or near the gallery.”

The museum — which received 6 million visitors last year — is “working closely with the police to help with their investigations,” a spokeswoman confirmed.

“All our thoughts are with the child and his family,” she said.

There is evil in the world. Not just far away, not just in the case of those who appear to possess it. It’s within the hearts of those we see, immemorable strangers who pass us by without incident. It’s there. Lurking.

Thank God, a 6-year-old child escaped its clutches. At least enough to stay upon the earth, in order to grow up and make it better.

Get better, little boy. We need you.

-ALEX

See 3 more pieces from me:

This Video Of Parents In The Armed Forces Surprising Their Little Children Will Leave You In Tears

Christmas Miracle: Dad Murders Baby, But There Was ‘Someone Watching Over’ Her

WATCH: Army Father Stuns His 6-Year-Old Son By Granting His Greatest Christmas Wish

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