A 15-year-old boy was stabbed in the back by a group of youths in Rushden on Sunday.
The boy was walking in the Chester Road and Spinney Road area with a friend at about 7.15pm on Sunday, January 25, when they were approached by a group of about three boys.
He was stabbed in the back twice by members of the group. His friend was also punched in the face.
The 15-year-old was taken to University Hospital Coventry with a collapsed lung. His condition is described as stable.
Witnesses, or anyone who knows anything about this incident, can call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.