Rumor says Sunday mornings' ground incident at Sweden's major international airport involved two B737ng-aircrafts taxiing into each other, approaching gates after arrival.
link in Swedish language, but with picture;
Plan i krock på Arlanda | Nyheter | Expressen | Senaste nytt - Nyheter Sport Ekonomi Nöje
Risk of winglets !, although this nordic country isn't so cramped that space separation between the two turks should be a factor ?