Photos that show Alba gluing posters – and then smiling and posing in front of the defaced billboard – were uploaded to the blog of shark activist White Mike, but have been removed. The photos were later re-posted on The Lost Ogle site.
“I got involved in something I should have had no part of,” Alba, 28, said in a statement.
“I realize that I should have used better judgment, and I regret not thinking things through before I made a spontaneous and ill-advised decision to let myself get involved with the people behind this campaign.
“I sincerely apologize to the citizens of Oklahoma City and to the United Way for my involvement in this incident.”
The incident was designed to raise awareness of the dwindling population of great white sharks.
White Mike has posted a statement on his blog about the incident, where he explains the reasoning behind the campaign.
“There is a dire need for us as a human race to try and stop the devastation of the Great White Shark. International pressure is the only way to do it and that starts in Oklahoma, the heartland of America,” he wrote.
Earlier in week, he had twittered, “Wow, so just blasted OKL in a big way!! Had a friend “tag” along no pun intended, I will post some images tomorrow.”
Police Sergeant Gary Knight said they discovered the posters, which were glued to a downtown bridge and a billboard displaying a United Way advertisement, and launched an investigation.
He added that investigators have not interviewed Alba, who is in Oklahoma filming The Killer Inside Me, co-starring Casey Affleck and Kate Hudson.
Bob Spinks, President of United Way of Central Oklahoma, said that the group accepts Alba’s apology.
“Just as she is passionate about her cause, we are passionate about serving the people of central Oklahoma,” Spinks said.
“The interesting thing about this is with our fundraising campaign kicking off today, it’s been sort of a funny thing that this has happened at this particular point. This is probably the best unearned media we’ve had in a long time.”