Six arrests have been made after a gang armed with knives entered the grounds of a Lancashire college and threatened students.
Staff at Runshaw College rang police at 10.40am on Monday after they received an anonymous report stating a group with weapons was heading to the college by train from Manchester.
A 17-year-old boy received a cut to his arm during the incident and was taken to hospital.
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The boy's injury was not serious, but could have been "much worse", police said as officers carried out inquiries to trace the "violent thugs" involved.
Three people who were inside a parked Nissan Micra close by were arrested. A fourth person who made off on foot was also arrested.
A Peugeot 306 was later stopped on the M55 and a fifth person was arrested in connection with the disorder. A sixth arrest was made on Monday evening.
"We know that this disorder is related to a personal issue between two members of each group," Leyland Police Chief Inspector Gary Crowe said.
"Thankfully only one person suffered a minor injury but it could have been much worse. To those who think it is acceptable to behave like violent thugs, my message is clear: You are not welcome in Leyland and we do not tolerate this kind of shocking, deplorable behaviour."
Anyone with information, or any mobile phone footage of the incident, was asked to contact police by calling 101 quoting incident reference 933 of March 4.
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The incident followed another stabbing in the North West, which took place near Altrincham, and resulted in the death of 17-year-old Yousef Makki.
The Manchester Grammar School pupil had phoned home just hours before the attack to tell his parents he would be home for tea.