The first video footage showing seven Koreans presumed to be sex slaves for Japanese troops during World War II was unveiled Wednesday, which researchers claim supports existing evidence and testimonies of Japan’s brutal trafficking of Asian women into front-line brothels.

The 18-second-long video clip, released by the Seoul Metropolitan Government and the Seoul National University Human Rights Center, features seven female captives of the US-China allied forces in China.

One of them is talking to a solider from the Chinese Army, while the rest are staring at the ground.

The SNU Human Rights Center, which has been searching for evidence on the Japanese wartime sexual enslavement, said the footage was filmed in 1944 in front of a private house used as a “comfort station” in Songshan, Yunnan Province, China. The women in the photo are the so-called “comfort women,” it claimed.

“Their appearance, such as the bare feet, suggest they were enslaved,” said SungKongHoe University professor Kang Sung-hyun, who participated in the study, in a press conference in Seoul.

There have been numerous photos and documented testimonies of surviving victims of the sexual slavery, but this is the first discovery of a moving image, the center said.

The women and the place captured in the clip match those shown in a set of photos released in 2000, he said. In the photos, four women are standing in front of a bunker with a Chinese guard after they were captured by the allied forces.

In other photos, women are seen being interrogated or receiving medical treatments.

It is highly likely that Sergeant Edwards C. Fay, a photographer from the allied forces, had taken the photo as well as the video, researchers said.

This article originally appeared on The Korea Herald.