A hostage incident caused moments of
terror at Milan's Duomo on Wednesday.
A man entered the cathedral and took a security guard hostage,
threatening him for several minutes with a knife.
The security guard was made to go down on to his knees.
Police rapidly arrived and persuaded the man to drop the weapon.
He was then arrested .
Anti-terrorism investigators are looking into the background of
the attacker, who is of North African origin.
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