The 15-year-old boy is in a stable condition in hospital with injuries not believed to be life-threatening at this time.
The 16-year-old remains in police custody.
Cumbria Police have arrested a 16-year-old boy on suspicion of grievous bodily harm after an incident at Walney School this morning (25 Jan).
Cumbria Police were called by NWAS at around 10.10am, reporting a pupil having suffered stab injuries following an incident inside Walney School.
The victim, a 15-year-old boy, has suffered multiple stab wounds to their body and has been taken to Alder Hey Hospital via air ambulance having suffered serious injuries.
A 16-year-old boy was detained at around 10.40am close to Barrow train station. He has been arrested on suspicion of grievous bodily harm with intent.
Police are in attendance at the school and can reassure the public and parents that there is no perceived wider threat.