A car was driven into a crowd in Berlin, injuring 29 people and killing one, in the latest of a string of attacks tied to Islamist extremism.

• A driver plowed through 29 people in Berlin, leaving one dead and many hurt.
• The attack is linked to a separate stabbing where the attacker reportedly shouted that God ordered the killing.
• Both are blamed on a radical Islamist ideology that calls for killing non-believers and promises paradise for it.
• The broader worry: these attacks keep happening across Europe and are expected to continue.

Outlook: More lone-attacker incidents like this are likely in Europe unless the underlying radicalization is addressed.