Two men were injured after a stabbing.
Police and paramedics were called to Guildford Road in Littlehampton after 6pm on Sunday.
A 30-year-old man was taken to hospital after he suffered a stab wound to the chest.
He remains in hospital in a serious but non-life threatening condition, police said.
Meanwhile another man reported a minor injury to his leg.
Neighbours reported seeing a police cordon in the residential street.
Police say a 47-year-old woman from Littlehampton was arrested on suspicion of causing grievous bodily harm with intent, and with assault occasioning actual bodily harm.
Police say the three involved were all known to each other, and said the woman remains in custody.
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