South Korean authorities are investigating whether a dead body that washed up along the inter-Korean border this week came from North Korea.

The body was found in the Imjin River in the northwestern city of Paju at around 9:20 a.m. Thursday, a police officer from the Paju Police Station told NK News.

“It seems the body had been drifting for quite a long time,” the police officer said, noting it was difficult to determine the person’s gender.

The body was found nearly nude, the police officer said, adding that investigators have not yet found evidence of a crime and