Book Two : Specific Provisions
Title Twelveter : War Crimes
Art. 264c
3 In especially serious cases, and in particular where the offence affects a number of persons or the offender acts in a cruel manner, a custodial sentence of life may be imposed.
4 In less serious cases under paragraph 1 letters c–g, a custodial sentence of not less than one year may be imposed.
National penalties - life imprisonment
EDIT.