Actress Jane Fonda apologized to Vietnam veterans and their families "who I hurt or whose pain I caused to deepen" for some of the "thoughtless and careless" things she did to protest the Vietnam War.

Fonda, who donned a helmet and was photographed sitting in the gunner's seat of an anti-aircraft gun during her visit to North Vietnam in 1972, said in a television interview with ABC's "20/20" to be broadcast Friday night that some of her behavior was insensitive."I would like to say something, not just to Vietnam veterans in New England (where veterans recently protested her plans to film a movie), but to men who were in Vietnam, who I hurt, or whose pain I caused to, to deepen because of things that I said or did," Fonda said.

"I feel that I owe them an apology," she said. "My intentions were never to hurt them or make their situation worse. I was trying to help end the killing and the war but there were times when I was thoughtless and careless about it and I'm very sorry that I hurt them. And I want to apologize to them and to their families."

Fonda said she does not think she was duped by Hanoi when she donned the helmet, posed for photographers and laughed in the gunner's seat of the weapon that aimed at American warplanes.

"I'm naive and I make mistakes but it was my fault that I sat there, you know," she said. " . . . I was a big girl. I could have said, `No, I can't do this.' It was my fault."

But the Oscar-winning movie star said she has not changed her opinion about the Vietnam War and was not repudiating all of her actions.