Another one has happened - Paris

[#1]

http://www.bbc.co.uk/news/world-europe-40332532

Though CNN reports the driver was shot dead, no doubt we'll hear more news in the next few hours.

[#2]

Oh dear  

The man was known to intelligence services, ?

its about time the supposedly intelligence service started to use some intelligence and arrest some , before its too late

[#3]

It's difficult to arrest someone without proof that they are planning to commit a crime, however well-known they might be to the police/security services.