'Unknown' Edges 'Number Four' for No. 1 Spot at Friday Box Office

The Liam Neeson action-thriller Unknown overtook the Alex Pettyfer sci-fi adventure I Am Number Four at the Friday box office, grossing $6.7 million from 3,043 theaters for Warner Bros. and Joel Silver’s Dark Castle.I Am Number Four, from DreamWorks and Touchstone, grossed an estimated $6.2 million from 3,154 theaters. Pic is the first DreamWorks title to be distributed by Touchstone under Disney