Stock Photo - 04 December 2018, Lower Saxony, Celle: The defendants and their defenders will stand in a courtroom of the Higher Regional Court before the start of the trial. Abu Walaa (right behind the glass wall), presumed leader of the terrorist militia Islamic State (IS) in Germany, and four other presumed top Islamists on trial are said to have recruited volunteers for the IS. From this Tuesday (04.12.2018) on a new witness will be heard. He is one of the convicted juvenile assassins of the Sikh Temple in Essen in 2016 with three injured. Photo: Holger Hollemann/dpa - ATTENTION: Judicial officers have been pixelated on court order. - Celle/Lower Saxony/Germany