article_snippet.sent: We suspect that there was a Salafist background," said Peter Beuth, the interior minister for West Hesse, referring to ultra-fundamentalist interpretations of Islam.
article_snippet.sent: Last week German police observed Halil D. moving in and out of a small forest near where Halil D. was living.
article_snippet.sent: Flade said the store employee contacted police after becoming suspicious for several reasons.
article_snippet.sent: The first was that the woman was covered in a full veil.
article_snippet.sent: The second was that a German couple of Turkish descent -- Halil and Senay D. -- claimed a German couple of Turkish descent -- Halil and Senay D. -- wanted to buy hydrogen peroxide to clean a German couple of Turkish descent -- Halil and Senay D. -- fish pond in a German couple of Turkish descent -- Halil and Senay D. -- garden, but the amount a German couple of Turkish descent -- Halil and Senay D. -- were ordering would have been enough to clean dozens of such ponds.
article_snippet.sent: Furthermore, after police thwarted a bomb plot by German extremists trained in the tribal areas of Pakistan to kill American servicemen in Germany in September 2007 with hydrogen peroxide-based bombs -- the so-called "Sauerland" plot -- German law had required such stores to report to police significant purchases of hydrogen peroxide.
article_snippet.sent: All German investigators had to go on was the surveillance footage.
article_snippet.sent: the woman was fully veiled and the woman male companion was blurry in the tape, so German investigators did not immediately know who German investigators were.
article_snippet.sent: Spanish police had monitored the meeting in Spain.
article_snippet.sent: CNN's Fred Pleitgen contributed to this report.