A man was killed in a bomb blast in Al Kharj area near here, the Saudi Interior Ministry said on Sunday.
The blast targeted a police vehicle in the region on Saturday night, the ministry's spokesperson was quoted by Saudi Press Agency as saying.
The explosion left two other patrol vehicles damaged. The nationality of the victim was yet unknown.
Saturday's blast was the latest in a string of bombings the kingdom has been witnessing since last year.
All the previous blasts were planned by the Islamic State group through its sleeper cells in the country.