Buckingham Palace is tonight on lockdown after police arrested a man who allegedly attacked two officers while armed with a sword in front of frightened tourists.
Police stopped the man at 8.35pm and discovered he was carrying a knife and two officers suffered 'minor injuries' to their arms when they detained him.
The man was later arrested on suspicion of grievous bodily harm and assault on police. Officers remain outside the world famous building this evening.
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Shocked bystanders took to Twitter on Friday night after witnessing the terrifying incident.