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A man has been taken to hospital following a medical incident.
An air ambulance landed on Rainham Rec, off Station Road, Rainham, while a police cordon was put in place in Wakeley Road at around 8am.
A police spokesman said officers attended to assist South East Coast Ambulance Service (SECAmb) with the incident.
Officers enforced a road closure, which had been lifted by around 9.30am.
The spokesman said it was a "medical incident" but no further details have been released.
A witness said there was an ambulance outside a house in Wakeley Road alongside one police car and two paramedic vehicles.
SECAmb declined to comment due to patient confidentiality.