A 39-year-old man is in a stable condition after being stabbed in his back, chest and legs.
He was taken to University Hospital Wales Cardiff following the attack at around 5.30pm on Friday, May 8.
Police were called to the scene of the attack at Llanarth Square, Pontymister, Risca at around 5.30pm.
A 47-year-old man from Risca was arrested on suspicion of attempted murder and is in custody.
Detective Inspector Michelle Chaplin, of Gwent Police, said: “Shortly after the incident yesterday, we arrested a man from the Risca area on suspicion of attempted murder, he remains in police custody.
“We currently have extra officers patrolling the Risca area and carrying out house to house enquiries.
“I can confirm we are not looking for anyone else connected to this incident but we appealing for any witnesses or any individuals who may have any information relating to this, to please contact Gwent Police on 101, quoting log reference: 2000158365.”
Crimestoppers can also be contacted anonymously on 0800 555 111.
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