Cops were scrambled to Jermyn Street in Liverpool this morning to reports of a fight.
When police arrived on the Toxteth Street they found a man, believed to be in his 40s, had been knifed in the back.
Officers detained a 47-year-old man at the scene, who was arrested on suspicion of a Section 18 wounding.
He has been taken into custody for questioning.
The victim has since been rushed to hospital where his condition has been described as non-life threatening.
More than 40 people have been stabbed to death so far this year in the UK amid a wave of knife crime.
Detective Inspector Judith Blease, of Merseyside Police, said: “At this stage we are trying to piece together the circumstances of this incident, which thankfully didn’t result in more serious injuries.
“Knife crime is a real concern for our communities and I want to reassure residents that we will be in the area today to carry out enquiries and speak to them.”
“Tell us what you know, directly or anonymously, and we take positive action.”
Forensic and witness enquiries are ongoing in the area today, with the immediate vicinity sealed off and police community support officers conducting house-to-house.