A 17-year-old boy has died after being stabbed in the center of town.
It happens on Easton Street in High Wycombe, Buckinghamshire, from 19:00 to 19:30 BST on Sunday.
Thames Valley Police said the boy died at the scene, and another boy, also 17, was injured but his injuries are not believed to be life-threatening.
Officers said they believe four offenders were involved, all of whom were wearing face coverings.
Senior investigating officer, Det Supt Kevin Brown said it was believed to be a targeted attack.
“We are in the early stages of our investigation and details of what happened are very limited at the moment,” he said.
“The incident occurred between 19:00 and 19:30, near the main Easton Street car park, at a time when members of the public would be using the parking lot, attending the theater or preparing for a concert night in town.
“It is therefore very important that anyone who is near Easton Street at this time and has seen something unusual or unusual or actually knows anything about this incident gets in touch as soon as possible. Good.”
Wycombe MP Steve Baker said: “This is a tragic incident and it’s important that we give the police space to conduct their investigations and for that reason I don’t want to say much about the incident. this ongoing investigation.
“But my heart goes out to the young man’s family and friends, whom I will no doubt feel distressed.
“For the people of Wycombe, they should know that the police are closely investigating the incident and that they have complete confidence in me as they follow things.”
A woman who worked near the scene of the stabbing, who did not want to be named, said that although she did not see the incident, she was “a bit scared because it was right on our doorstep because my store is only 10 meters away”.