That is what is called the Madrid Syndrome, France is awash with AK-47 and similar weapons. It is a deal that is in place that criminals organized crime will not sell weapons to Islamic terrorists, whether they turn them in, they disappear, I am not really concerned. They thought he was a criminal similar to a a member of the Madrid cell, who procured most of the supplies for that attack. Since Madrid there has been one or two attacks, so the cooperation has worked well.
Israeli army lifts closure on West Bank town of Qabatiyah after three days (Haaretz)
from the article: London, Boston, Toulouse: Terror overwhelming Western intelligence