A 14-year-old boy has been arrested on suspicion of the murder of another boy of the same age.
The teenager has been detained and is in custody after the other youngster died following an attack in Gateshead, Northumbria Police said.
Police found the boy with injuries that were “consistent with having been caused by a bladed article” in the Aycliffe Crescent area of the Springwell estate at just after 8pm on Monday.
The youth died in hospital in the early hours of Tuesday, the force said, and a murder investigation was launched.
A 13-year-old girl has also been arrested on suspicion of assisting an offender and also remains in custody.
Chief Superintendent Helena Barron said: “A teenage boy has sadly died and his family have been left devastated beyond belief.
“Our thoughts are very much with his loved ones at this time and we are supporting them in every way we can.
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“We are determined to find out exactly what happened and a full investigation is ongoing into the circumstances surrounding this tragic incident.
“We have arrested two teenagers in relation to the incident and officers remain in the area to carry out a range of enquiries and offer reassurance to the community.
“While incidents of this nature are rare in our region, whenever they do occur we are committed to bringing those responsible to justice.”