Police arrested a teenage boy near Stamford Bridge after Chelsea's derby victory over Fulham on Saturday.
Officers were alerted to an individual displaying a weapon in the Fulham Broadway area.
An arrest occurred following the conclusion of the west London derby
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An arrest occurred following the conclusion of the west London derbyCredit: Getty
A 16-year-old male was then detained on suspicion of carrying an imitation firearm.
talkSPORT has been told social media speculation of a mass shooting attempt is not true.
A Metropolitan Police spokesperson said: "A 16-year-old boy remains in police custody after he was arrested on suspicion of possession of an imitation firearm.
“The arrest occurred in Fulham Broadway at 14:41hrs on Saturday, 30 August after officers received information about a boy displaying a weapon and walking towards a crowded area.
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“No one was injured in the incident.”
The Met Police are continuing their investigations amid early suggestions the boy was on his way to a comic book convention in Hammersmith.
It is an offence to carry an imitation firearm and the weapon is thought to have looked realistic, causing alarm to passers-by.
The incident occurred as fans were leaving Stamford Bridge following Chelsea's 2-0 win over Fulham.
Goals from Joao Pedro and Enzo Fernandez sent the Blues top of the Premier League ahead of the 3pm fixtures.
The game was marred with controversy as Fulham teenager Josh King had a goal disallowed by VAR.
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Chelsea were then awarded a second-half penalty following another VAR review for a handball.
More to follow...