![London Attacker Khaled Masood was known to British Security Services](https://eng-archive.aawsat.com/wp-content/uploads/2017/03/London-attack-reuters.jpg)
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Caption:
Caption:
Police officers observe a moment’s silence outside New Scotland Yard in Westminster the day after an attack, in London, Britain March 23, 2017. REUTERS/Stefan Wermuth
![London Attacker Khaled Masood was known to British Security Services](https://eng-archive.aawsat.com/wp-content/uploads/2017/03/London-attack-reuters.jpg)
Police officers observe a moment’s silence outside New Scotland Yard in Westminster the day after an attack, in London, Britain March 23, 2017. REUTERS/Stefan Wermuth