Los Angeles/New York - Transformers: Age of Extinction, the fourth film in the series of films about form-changing robots that save the planet, racked up $100m at the box office, jump-starting a sleepy summer with the year's biggest opening weekend.
22 Jump Street, starring Channing Tatum and Jonah Hill, was second with $15.4m in its third week in movie theatres, according to studio estimates.
The animated film How to Train Your Dragon 2 took the No. 3 spot with sales of $13.1m for the Friday through Sunday period at US and Canadian theatres.