The father of a British teenager killed in Syria says his son, Abdullah Deghayes, did "a brave thing" by going to fight against Bashar al-Assad's forces.
ITV News reporter Sejal Karia reports.
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"Our ability to pre-empt or respond to threats will be eroded if we don't keep up with our adversaries."
"You are one of the silence breakers and we all owe you a debt of gratitude."
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