article_snippet.sent: Flade, a journalist at Die Welt and terrorism researcher who first broke the story of the police raids, told CNN that a German couple of Turkish descent -- Halil and Senay D. -- were under arrest.
article_snippet.sent: a German couple of Turkish descent -- Halil and Senay D. -- were under arrest said a German couple of Turkish descent -- Halil and Senay D. -- had ties to radical Islamist circles in the Frankfurt area.
article_snippet.sent: Flade said that according to German police documents, German police first became aware of a German couple of Turkish descent -- Halil and Senay D. -- at the end of March when German police went to a garden center near Frankfurt to purchase hydrogen peroxide.
article_snippet.sent: According to Flade, after the tipoff, German investigators began trying to figure out who a German couple of Turkish descent -- Halil and Senay D. -- were.
article_snippet.sent: But in early to mid-April German investigators were able to identify German investigators and start surveillance to investigate a German couple of Turkish descent -- Halil and Senay D. --'s radical ties.
article_snippet.sent: According to Flade, German police established that a German couple of Turkish descent -- Halil and Senay D. -- had recently traveled to Spain, where German police met with members of Sharia4Spain, a radical pro-jihadist group linked to Al Muhajiroun in the United Kingdom.
article_snippet.sent: Spanish police also established that a German couple of Turkish descent -- Halil and Senay D. -- had links to radicals who had gone to fight with AQIM, al Qaeda's North African affiliate .
article_snippet.sent: And Spanish police found a German couple of Turkish descent -- Halil and Senay D. -- were in contact with a young radical Islamist from Frankfurt who had gone to fight in Syria at the end of last year and was recently killed.