Police : He says , ` ` Six of my family members are still missing '' NEW : At least 250 people were on board when boat collided with another boat , police say . NEW : More than 60 people remain unaccounted for , an official says . Ferry accidents are common in Norway .
NEW : Survivor says , `` Six of my family members are still missing '' NEW : At least 250 people were on board when boat collided with another ferry , police say . NEW : More than 60 people remain unaccounted for , an official says . Ferry accidents are common in Bangladesh .