South Korea ? Police said Tuesday a 69-year-old man upset over a land dispute has admitted setting the fire in Seoul that destroyed the 14th-century gateway considered South Korea’s top cultural treasure.

The suspect in the arson at the Namdaemun gate, identified only by his family name, Chae, was arrested late Monday on Ganghwa Island, west of Seoul.

The suspect “has confessed his crime,” said Kim Young-soo, head of a police station handling the case in Seoul.

The fire broke out Sunday night and burned down the wooden structure at the top of the Namdaemun gate, which once formed part of a wall that encircled the South Korean capital. The structure collapsed as hundreds of firefighters attempted to get the blaze under control, officials said. The gate’s large stone base remained intact.