Officers recovered a BB gun from the suspects (Credit: Havering MPS)
Two men, aged 18, and two girls, aged 17, were detained in The Brewery earlier today.
The suspects are all from the Romford and Dagenham areas.
Officers found the weapon was a BB gun and no one was harmed.
A BB gun is a type of air gun which uses compressed air to fire pellets.
It is currently an offence to have an air gun in a public place without a reasonable excuse. However, it is up to the courts to decide what constitutes a reasonable excuse.
The arrests were carried out by officers from the East Area Licensing Team.
An investigation into the incident is ongoing.
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