Please note a sign is pixellated by photographer to prevent indentification of location. Firearms instructors playing the part of terrorists during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(02 of14)
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Embargoed to 0001 Wednesday December 2 Firearms instructors play the role of terrorists during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(03 of14)
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Embargoed to 0001 Wednesday December 2 Firearms instructors play the role of terrorists during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(04 of14)
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Embargoed to 0001 Wednesday December 2 Firearms instructors play the role of terrorists during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(05 of14)
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Please note police shoulder number pixelated by photographer to prevent identification. Armed Response Vehicle (ARV) officers during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(06 of14)
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Embargoed to 0001 Wednesday December 2 Armed Response Vehicle (ARV) officers during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(07 of14)
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Embargoed to 0001 Wednesday December 2 Armed Response Vehicle (ARV) officers during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(08 of14)
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Armed Response Vehicle (ARV) officers during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(09 of14)
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Embargoed to 0001 Wednesday December 2 Armed Response Vehicle (ARV) officers during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(10 of14)
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A firearms instructor play the role of a terrorist during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(11 of14)
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Embargoed to 0001 Wednesday December 2 A firearms instructor play the role of a terrorist during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(12 of14)
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Dummies representing civilian casualties lying on the ground, during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(13 of14)
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Dummies representing civilian casualties lying on the ground, during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)
Met Police terrorist training exercise(14 of14)
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Embargoed to 0001 Wednesday December 2 Firearms instructors play the role of terrorists (left) during a Metropolitan Police training programme for armed officers when responding to a terrorist firearms attack. (credit:Yui Mok/PA Wire)