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A host of emergency services have been pictured attending an incident.
Crews from the fire service and police were seen in London Road, Swanley, outside B&M Supplies just after midday.
Witness Paul Wight was walking to lunch when he saw the air ambulance overhead.
He said: "I have no idea what happened, but it's obviously serious.
"When I saw the emergency services I immediately thought someone had been hurt at the service shop, but I have no idea.
"There's no smoke or anything and I heard no explosions."
Police spokesman Martin Very said: "We were called at around 12.15pm to a medical incident on London Road, Swanley.
"Officers attended the scene where they assisted South East Coast Ambulance Service."
The ambulance and air ambulance service have been approached for more information.
More as we get it.