The police stated the attack at Runshaw College had resulted in a 17-year-old boy being nicked on the arm.
"A sixth arrest has been made following an incident of disorder close to a college in Leyland", the statement read.
"We know that this disorder is related to a personal issue between two members of each group. There is nothing to suggest there are any further fights planned", Gary Crowe, a chief inspector from South Ribble Police, was quoted as saying in the statement.
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The incident followed a previous call to police on the morning of 4 March from a member of staff at Runshaw College.
The staff member said they had received an anonymous report, stating that a group of people were planning to come to the college with weapons by train from Manchester.