The weapon recovered by police (Credit: Metropolitan Police)
Officers were alerted to a possible sighting of a firearm in Heathway, Dagenham, at around 11.40am today.
They discovered the suspects had boarded a London Underground train going towards Barking.
The officers intercepted it at Barking station at around 12.10pm and recovered the weapon.
A 16-year-old male was arrested on suspicion of being in possession of a firearm.
He has been taken to an east London police station.
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