Police were called to reports of a gunman walking the streets of Mottingham.
Officers rushed to Dunkery Road shortly after 3pm to an alleged sighting of a man carrying a firearm.
A search was made of the immediate and surrounding areas, but no trace of the suspect or a firearm was found.
No arrests were made.
Nearby schools, including St Vincent's, were reportedly on lockdown as police attended the incident.
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