Police are tracking down the person who vandalized with graffiti the walls of Gyeongbok Palace in central Seoul. 

Officials at Jongno Police Station said Saturday they launched the investigation upon receiving a report of the apparent vandalism at 2:20 a.m.

A phrase that reads "free movie" in Korean was repeatedly sprayed in red and blue paint along the western walls of the royal palace.

According to the officials, police are analyzing CCTV footage and reviewing whether they can hold the suspect accountable for violating the Cultural Heritage Protection Act.