Police were called to Oxford Street on Tuesday evening after reports that a man had been stabbed.
A man in his 20s was taken to hospital with serious injuries.
A man, aged 52, was later located by police and arrested on suspicion of assault. He remains in police custody for questioning.
Enquiries are ongoing.
Anyone with information should call 101 quoting incident 2352 of 19/10/2021.
Details can be passed anonymously to the independent charity Crimestoppers on 0800 555 111.
