The patrol was targeted while on duty in the neighbourhood of Al-Musara, killing Corporal Abdullah Treiki al-Turki and wounding six other police officers, the interior ministry said, cited by the official SPA news agency.
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The ministry blamed the attack on 'terrorists', without giving any further details.
The attack occurred in the same area where a policeman was killed and three others wounded in a bombing on Tuesday morning.
Saudi authorities have been bulldozing al-Musawara, a small
part of the town with narrow streets which date back more than
200 years, to make way for a new project. Local officials say wanted militants believed to be behind attacks on security forces have been using the narrow streets to escape arrest.
Three people, including a police officer, were also killed last month in bombings in Qatif, where most of Saudi Arabia's Shia minority lives. The region has been rocked by unrest since 2011.
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Saudi Shias complain of discrimination by the government, a charge that authorities deny, and have carried out protests for more rights for the last several years. Demonstrations and attacks have both become more frequent since Nimr al-Nimr, a Shia cleric convicted of involvement in violence, was executed a year ago.
Authorities have blamed the unrest on 'terrorists' and drug traffickers.
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