Five people have now been temporarily suspended from frontline duties while an investigation takes place.
A Heckler & Koch submachine gun, a Glock pistol, a Taser and ammunition were reportedly inside the bag.
The Metropolitan Police’s Directorate of Professional Standards has confirmed it is reviewing what happened.
In a statement, it said: “A member of the public called police after finding a bag containing Met-issued firearms and a Taser on a street in south London.
“Within seven minutes of the call to police, officers arrived at the scene and safely recovered the items.
“At this stage it is believed the bag was misplaced by on-duty officers a short time before the member of the public
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