berlin iraqi man preacher accuse recruit fighters islamic state syria iraq include two believe kill 150 iraqi soldier suicide bomb go trial german court wednesday four allege members islamist network set also stand trial prosecutors say 33-year-old preacher identify ahmad abdulaziz abdullah a. court document recruit least seven individuals end travel middle east fight alongside islamic state militants two die two separate suicide bomb attack iraqi army position 2015 150 soldier kill prosecutors say two recruit identify mark kevin join islamic state 2014. main suspect know nickname abu walaa arabic mean father loyalty four others turk german serbian-german dual citizen national cameroon arrest november raid state low saxony north-rhine westphalia hold custody since defendants choose remain silent trial men hold religious lessons potential recruit hand radical islamic material prosecutors say prosecutors believe abu walaa preach fussilet mosque berlin attend fail asylum seeker kill 12 people christmas market german capital last year federal prosecutor essentially accuse suspect members support foreign terrorist organization spokeswoman high regional court northern city celle say michael murat sertoez lawyer one suspect say lot protect witness testify acceptable us allege islamic state recruiter go trial germany