However , due to the darkness and the number of people involved , police chief Wolfgang Albers conceded that their efforts were not effective .
In Cologne , police dispatched 143 local officers and 70 federal officers to restore order .
Due to the darkness and the number of people involved , police chief Wolfgang Albers conceded that their efforts were not effective .
In Cologne , police dispatched 143 local officers and 70 federal officers to restore order .