A Saudi security officer was killed and a second was wounded on Sunday in a drive-by shooting in Qatif.
The shooting occurred while the security men were on patrol, Al Arabiya TV reported.
It gave no information about the assailants but said authorities were expected to release more details later.
Gunmen shot dead two security officers last week on a residential street in nearby Dammam. Another two were killed in Dammam in September.
* Reuters
