Dhaka, Aug. 11 -- Zach Cregger's horror film Weapons dominated the weekend box office, opening with $42.5 million domestically from 3,202 theaters and $70 million internationally. The debut marks Warner Bros. Pictures' seventh No. 1 opening this year, and its sixth consecutive film to launch above $40 million domestically.

Disney's Freakier Friday, a sequel to the 2003 hit Freaky Friday starring Lindsay Lohan and Jamie Lee Curtis, took second place with $29 million from 3,975 North American theaters. Both films benefited from viral marketing and strong social media buzz, according to Comscore's Paul Dergarabedian.

Weapons, set in the small town of Maybrook where 17 children vanish at 2:17 a.m., earned a 95% Rotten Tomatoes score and fol...