berlin german court sentence 27-year-old german supporter islamic state three years three months prison monday plot lure police soldier trap kill home-made bomb rule come german authorities high alert ahead tuesday anniversary attack last year fail tunisian asylum-seeker plow truck crowd outdoor christmas market kill 12 people prosecutors say suspect identify sascha l. carry two successful test home-made explosive device hometown january inquiry find two videos accuse pledge allegiance islamic state leader however court rule monday evidence man personal connection islamist militia financially support militia german broadcaster ndr report ndr say court grant leniency since cooperate authorities arrest confess plan german magazine spiegel report man part far-right scene past convert salafism ultra-conservative islamist creed man arrest february admit plan attack chemicals could use make explosive devices find search home town northeim central germany three men charge accomplices convict man also appear court two convict one sentence three years probation 100 hours community service third person acquit last week german police raid nine locations berlin eastern state saxony anhalt investigation four people suspect plan islamist-motivated attack german ex-rightist jail plot islamist attack police