A man suspected of supporting the extremist militia organization Islamic State was arrested at Berlin’s central train station on Thursday, the German public prosecutor’s office announced. It said the man was being investigated for supporting a terrorist organization abroad, among other charges. He is being held in custody. According to German public broadcaster agency ARD, the suspect is a 34-year-old man who has German citizenship and most recently lived near the central train station, though possibly without a permanent address. He is said to have travelled a lot in the last few weeks, inclu…