Foundry Approach was closed off by West Yorkshire Police on Friday evening (June 19) causing bus servies to be diverted.
The force confirmed officers had been sent to the scene after being contacted by the ambulance service.
The boy has been found injured. Another 17-year-old has been arrested on suspicion of causing grievous bodily harm.
A statement by West Yorkshire Police said: "Police were called at around 5.40pm yesterday by the ambulance service, to a report of an injured male on Foundry Approach.
"The male, aged 17, had sustained a slash wound to his arm.
"A 17-year-old man was arrested on suspicion of causing grievous bodily harm and remains in custody.
"Enquiries remain ongoing."
Anyone with information is asked to contact police on 101, quoting crime reference 13200307074.
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