Media and fans underwent extra bag checks for the open air red carpet at Hollywood's Pantages Theatre on Thursday, where the cast spoke of their regret at the Manchester pop concert bombing that killed 22 people.
Britain raised its terror alert to critical and movie studio Warner Bros. said on Wednesday it had decided to cancel its May 31 premiere in London for "Wonder Woman."
Israeli actress Gal Gadot, who plays the comic book superheroine, told reporters she was "familiar, unfortunately, with these types of events."
"I think it was a good idea not to do the premiere in London... As an Israeli, I can tell you we always say we need to celebrate life and life is stronger than anything and now we're trying to celebrate life, right? So it's mixed feelings but the show must go on, I guess."
Director Patty Jenkins said she was not concerned about canceling the film's London premiere.
"All of our eyes on the UK right now and we're heartbroken. It's not the time to celebrate anything and I'm only happy that we really did make a movie about love and trying to be better people.
"That's the message that needs to be out in the world right now but it's not a time to celebrate anything else," Jenkins said.The film, the first live action feature film built around the 1941 DC comic book character, also stars Chris Pine and Robin Wright. It starts its rollout in movie theaters worldwide on May 30.