The Guelb El-Kebir massacre took place in a small town near Beni Slimane (Medea, Algeria; see on the night of the 19 and 20 September 1997. 53 people were killed. La Tribune ( 21 September ) is quoted as claiming that the massacre was committed by the AIS to punish the village for supporting the GIA.
References
Guelb El-Kebir massacre Wikipedia(Text) CC BY-SA