Three people have been treated for minor injuries after a substance was delivered in an envelope to a restaurant at Borough Market.
The property at Stoney Street has been evacuated as a precaution on Thursday August 10.
Police do not believe the incident is terror related.
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Police have said the substance is a “naturally occurring substance”.
In the rest of the Metropolitan Police’s updated statement, it said:
Three people were treated at the scene for minor injuries as the result of an irritant and did not require hospital treatment.
The premises will be handed by officers back over to the owners soon.
No arrests have been made.
This is not being treated as a terror related incident.
What we know so far
This is our latest story on what we know so far about the incident at London Borough Market:
Businessman recounts events of London Borough Market incident
Paul Dawson, a local businessman, said he arrived at the Feng Sushi restaurant on Stoney Street just after the police.
He said: “There were two uniformed police in there.
“The manager was flustered and said ‘sorry, we’ve had something quite bad happen, we have to close.”
“Plain-clothes police officers, ambulance and fire services then arrived at the scene,” he said.
“A community warden then told me that a white powder had been received,” Mr Dawson added.
“I asked him for where he heard that and he couldn’t say.
“Police on the scene didn’t confirm anything. And Borough Market security said ‘some kind of corrosive material attack or incident.
“That’s it. Life carried on as normal in the market which is on its second busiest day of the week.”
London Ambulance Service treating one patient for minor injuries
A spokesman for the London Ambulance Service said: “We were called at 1.44pm to an incident on Stoney Street.
“We sent an ambulance crew, an Incident Response Officer and members of our Hazardous Area Response Team.
“We are currently treating one patient at the scene for minor injuries.”
Images of the incident near London Borough Market
Fire fighters use protective gear in London Borough Market incident
London Fire Brigade said firefighters using protective equipment were inside the building after they were called to assist police with a “chemical incident”.
Three people have been treated for minor injuries
The Metropolitan Police were called police were called to reports of an unidentified substance being delivered in an envelope to a business in Stoney Street, at 1.38pm on Thursday, August 10.
A spokesman for the Metropolitan Police said: “Officers, London Ambulance Service and London Fire Brigade are in attendance.
“The property has been evacuated as a precaution.
“Three people have been treated for minor injuries.
“A crime scene is in place.
“No arrests have been made.
“At this early stage this is not being treated as a terror related incident.”
London Fire Brigade in Borough Market
Firefighters are outside Feng Sushi by London Borough Market after an unidentified substance was delivered to the area in an envelope