A 14-year-old boy is critically ill in hospital after being stabbed in the neck outside a shop, police said.
The schoolboy was attacked as he left the Lifestyle Express Store in Upper Spon Street, in the Earlsdon area of Coventry, at around 5.40pm on Monday.
West Midlands Police said officers had arrested a 32-year-old man from Coventry on suspicion of wounding with intent to cause GBH.
A 41-year-old man has also been arrested in connection with the incident.
A police spokesman said the victim, who was stabbed with a large carving knife, had undergone emergency surgery and was in a critical condition at a specialist hospital unit in Nottinghamshire.
Detective Inspector Martin Slevin said: "It appears the lad was in the newsagent with a female friend when an argument broke out with a man.
"The victim left the shop and seconds later, no more than 15 yards from the shop entrance, was stabbed in the neck by a large bladed knife.
"I'd urgently like to speak to anyone who was in the Lifestyle Express Store, the nearby William Hill bookmakers, or Upper Spon Street at around 5.40pm and may have seen the attack.
"We believe the offender ran off through Spon Gate Estate and emerged into Rover Road, a service road opposite Ikea which leads to the market. The offender would have been covered in blood and again I'd ask for anyone who believes they saw this person to contact me."
Anyone with information about the attack is urged to contact officers at Chace Avenue Police Station on 0345 113 5000 or Crimestoppers anonymously on 0800 555111.