The Iranian national was arrested in Castrop-Rauxel near Dortmund on suspicion of procuring toxins, including cyanide and ricin to carry out a terror attack.
The accused was an accomplice of another Iranian migrant Kabuli Jafri, who was arrested by the property cell of Mumbai Police in September this year in connection with a series of chain snatching and cheating cases while posing as a crime branch officer in Mumbai, police said.