Highway-shooter

I just read in the local news that the highway-shooter is back. At night he goes up on the bridges and shoots randomly on cars!

He hit three cars this time. People have not been hurt yet, but one lost control over his car last time due to the loud bang.

You need a gun license here to own one. Still the police cannot find out from what kind of gun the projectiles come.
A reward of 1500€ is set on the shooter.

He shoots randomly!!! Why would he/she do that?

I´m on the highway every working day... just at daytime, though.
It´s really frightening...

Addition

New ist this article. The newspaper says they got the news from the police only because they asked for it - the police wanted to hide the information. And last time a woman had been injured.

Man, this is just a little town here!