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The boss of MI5 Sir Ken McCallum today expressed his 'deepest sympathies' following the devastating Manchester synagogue attack as he warned the threat of another terror attack in the UK remained 'substantial'.

The director general of the spy agency, speaking at his annual speech to outline the threat from terror groups and hostile states, told reporters: "Just two weeks ago at Heaton Park synagogue in Manchester, we saw horrific violence against a community at prayer on the holiest day in the Jewish faith. I offer my deepest sympathies to those bereaved, injured and affected by this sickening act of terror."

Adrian Daulby, 53, and 66-year-old Melvin Cravitz, both from Crumpsall, died during the attack, which unfolded on Yom Kippur, the most holy day in the Jewish calend

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