I dont think this will be the last arrest. They are watching lots of people as per FAQ section in same BBC article.
Q & A: European terror arrests
The BBC’s security correspondent Frank Gardner explains the background to the terror arrests in Italy.
What happened in Italy?
This does seem to be a very serious raid undertaken by the Italian police.** The raid took place on Wednesday and unlike in the UK, where such raids happen unannounced, Italian TV was invited along on this raid.
There are amazing TV pictures of them going into this ramshackle crumbling farm house near Venice, which according to the media reports was littered with beer cans, which is not very Islamic behaviour. **
Inside the arrested a gang of five Moroccans who had 1kg of C4 explosives hidden in a sock under a pile of laundry.
**This is the third plot that the Italians have been able to thwart and it won’t be the last. There was a previous plot to blow up St Peter’s Square in Venice and one to poison the water supply in Rome as well.
The Italian authorities have told me they are watching 500 suspects and they believe there are at least 12 sleeper cells in Italy and it looks now like one of them has gone active. **
Since September 2001 there have been more than 100 arrests in Italy. All of these have been involved in logistics, this one seems to be an operational plot.
