A woman was taken to hospital after being sprayed in the face with an "unknown substance".
Emergency services including ambulance and fire were called to Bunnett Avenue in King's Lynn just after 8.45pm on Sunday.
They had received reports that a woman aged in her 40s had been sprayed with an unknown substance.
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She was taken to the Queen Elizabeth Hospital for further assessment and treatment.
A Norfolk Constabulary spokeswoman confirmed a man in his 30s was arrested on suspicion of grievous bodily harm and taken to King’s Lynn Police Investigation Centre for questioning, where he remains.
The woman has since been arrested on suspicion of assault and taken to King’s Lynn Police Investigation Centre for questioning, where she also remains.
Both parties are believed to be known to one another.
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