A teenage girl was killed on Sunday in Berikon, canton Aargau.
The 15-year-old was found with fatal stab wounds in a forest near the Schützenhaus shooting range.
A 14-year-old girl from the same region has been arrested.
She was also injured, though not critically, and remains in hospital under police guard.
Authorities say both girls attended the Mutschellen district school. Police interviewed staff and students at the school yesterday.
Police are still searching for witnesses, they believe the attack happened where the victim was found.
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