Kim Phuc was in Trang Bang, Vietnam, on June 8, 1972, when southern Vietnam dropped napalm on the town. Phuc became known as the “napalm girl” when the photo went on to win the Pulitzer Prize and be displayed worldwide, including at the Vietnamese War Museum in Ho Chi Minh.

On Saturday, The Stringer premiered at the Sundance Film Festival, the first time the AP saw the film in its entirety. In it, former AP photo editor Carl Robinson said he was told by a superior to give Nick Ut credit for the photo that the film claims was actually taken by NBC News driver Nguyen Thanh Nghe. Nguyen said the AP gave him $20 for the photo and a printed version that his wife has since destroyed.

“In a report published last week, AP outlined its findings to date, making clear we had seen nothing that proves Nick Ut did not take the photo,” the outlet said in a statement since seeing the documentary. “We also made clear we welcomed the opportunity to review any additional materials in pursuit of the facts.”

According to the AP, it wasn’t allowed to speak to Robinson unless it agreed to “conditions.” The outlet believed these conditions would have “hindered our ability to fully investigate and would have prevented us from correcting the record” and conducted a six-month investigation, including interviewing five people there that day. The documentary features the on-camera interviews of some 45 people.

Ut and Phuc offered statements via their shared attorney denying the claims. Neither gave interviews to the documentary.

Phuc has gone on to start her own organization to help children flee their countries during war and most recently helped a group of Ukrainian children escape to Canada in 2022 shortly after Russia invaded Ukraine.