Police have appealed for witnesses after a man received minor stab wounds in a scuffle with four men at a shop in Nottingham city centre.
They grabbed the 19-year-old as he stood near the entrance of the Bank clothing shop, in Clumber Street, just before 1530 GMT on Thursday.
After the assault, the suspects then casually walked out of the shop towards Bridlesmith Gate, police said.
Det Con Mike Ebbins said plenty of people would have seen what happened.
He said: "This took place at a time when Clumber Street would have been at its busiest, during the half term holidays.
"There are several people who will have seen the offenders leaving the shop, who maybe did not realise what had happened.
"The offenders showed a total disregard for other people in the shop at the time and it is important that anyone who witnessed the attack or with information contacts us."
The injured man received treatment for injuries described as not life-threatening at Nottingham's Queen's Medical Centre, where he remains in a stable condition.
The four suspects are believed to be three black and mixed race men and a white man, who were all wearing dark clothing.