Police were called to Norwich city centre to deal with a row between two people.
It happened in Hay Hill at around 12.30pm on Thursday.
Police confirmed that one woman had been arrested at the scene and taken into custody.
An eye-witness said there was an altercation between two people, one of whom appeared to be drunk.
A police spokesperson said: "Officers were called to an incident in the Haymarket in Norwich at around 12.30pm today following reports a female was being verbally abusive and making threats.
"A girl, aged in her late teens and from the Norwich area, was arrested a short time later on suspicion of a public order offence.
"She remains in custody at this time."
They added an off-duty officer intervened, before more of his colleagues showed up.
The arrested woman is being processed by police.
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