He planted a small bomb in a KaDeWe department store in West Berlin, and phoned from East Berlin (Still very different areas, East Berlin's infrastructure and police services often not connected to the Western equivalents). He successfully extorted 500,000 DM. He returned to extortion in 1992, having spent the money, placing a bomb in Karstadt in Hamburg. He set up a complex money transfer scheme, with a box attached magnetically to a train. In August, he escaped with the box, but it contained only a few hundred marks, otherwise being filled with scraps of paper. He continued to target Karstadt stores through 1993 and 1994, but did not obtain any further money.