![London Attackers Slipped by Despite an Avalanche of Warnings](https://eng-archive.aawsat.com/wp-content/uploads/2017/06/07suspects-master675.jpg)
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Caption:
Caption:
Khuram Shazad Butt, left, in a London park last year, when he was said to have attacked a counterextremism advocate. Usama Hasan via The New York Times
![London Attackers Slipped by Despite an Avalanche of Warnings](https://eng-archive.aawsat.com/wp-content/uploads/2017/06/07suspects-master675.jpg)
Khuram Shazad Butt, left, in a London park last year, when he was said to have attacked a counterextremism advocate. Usama Hasan via The New York Times