1.   Before the aiport shootings, attacks had been mostly at isolated biker clubhouses, but afterwards the outbursts were increasingly public.

2.   In October, Denmark banned biker clubhouses from residential areas.

3.   The violence once was centered around rural biker clubhouses, but in the past year has increasingly broken out in populated areas.

4.   Until then, the violence had been centered around rural biker clubhouses, but since then the violence has become increasingly public.

5.   Two men were injured, one seriously, late Wednesday in a shootout at a biker clubhouse in central Oslo, Norwegian police said Thursday.