A pedestrian wipes her tears as she walks by the site of a car crash in central Seoul which killed nine people earlier in the week, July 5. Yonhap

Police have booked a man in his 20s for leaving a deriding note at the site of this week's deadly car crash in central Seoul that killed nine people and injured seven others, officials said Friday.

The Seoul Namdaemun Police Station said the man turned himself in Thursday as images spread online of his message left at the crash site where people have laid flowers to mourn the victims. It was also featured in media reports.

Police have since booked him on charges of defaming the deceased.

On Monday night, a sedan driven by a 68-year-old darted in the wrong direction for some 200 meters on a one-way road near Seoul City Hall before crashing into sidewalk guardrails, striking pedestrians and ramming into two other cars.

"We plan to continue investigating the detailed motive and circumstances of the crime," an official said.

Police have also launched a preliminary probe into a separate note allegedly deriding the victims found at the crash site and three similar online posts, officials said. (Yonhap)