Bielefeld (AFP) On Thursday morning in North Rhine-Westphalia, the police arrested a 15-year-old girl who was said to have killed his three-year-old half-brother in Detmold with a knife and then fled. A witness gave an indication of the youth, which was then arrested by a district official in Lemgo-Brake, as the prosecutor Detmold and the police Bielefeld announced. The background of the bloody act of Wednesday evening was initially unclear.