The Port of Tyne confirmed there is an on-going incident at the South Shields site.
No-one has been injured and there was no explosion.
There has been an incident, we're working with the fire brigade at the minute.
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A man was threatened with a knife as he worked in a barber shop.
It comes after a weapon, known commonly as a BB gun was taken into a pub on Goodramgate in York on Friday 23, February.