A 17-year-old from northern Germany was sentenced to four years in a juvenile detention facility for his part in a planned attack on a Christmas market, a court spokesman said on Friday. He was found guilty of conspiracy to commit murder, a spokesman for the Neuruppin district court announced. In the closed main hearing, the accusations of the public prosecutor general’s office were essentially confirmed, the spokesman said. The accused, a Chechen, had become increasingly radicalized and had agreed with a 15-year-old accomplice to procure a truck and use it to kill as many people as possible a…