WESTFIELD, Mass. (AP) — Police investigating the stabbing of a teenage girl in Westfield say she was injured during a pre-arranged fight involving seven other girls.

Westfield police told The Republican newspaper (http://bit.ly/1LOJxp1 ) that the fight at a playground Thursday night involved some girls from Westfield and some from Springfield.

A 15-year-old girl involved in the brawl was stabbed in her arms and legs. Police say she's being treated at a hospital for non-life threatening wounds.

Authorities say the girls decided to "square off" against each other. What sparked the fight wasn't disclosed.

None of the girls' names have been released because of juvenile offender laws.

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Information from: The Springfield (Mass.) Republican, http://www.masslive.com/news/