An explosive device detonated at a security patrol on Monday in Al-Awamiyah village in the Qatif province, the official SPA news agency quoted a ministry spokesman as saying.
The spokesman said an investigation has been launched into the attack.
The attack was the third in the same area this month.
On May 16, a soldier was killed and another five were injured when their patrol came under a rocket attack in Qatif.
A week earlier, a child and a Pakistani resident were killed by gunfire in the same province.
Awamiyah has witnessed anti-regime protests since 2011, with demonstrators demanding free speech, the release of political prisoners, and an end to economic and religious discrimination.
The protests have been met with a heavy-handed crackdown by the Saudi regime.
The rallies intensified after the January 2016 execution of respected Shia cleric Sheikh Nimr al-Nimr.
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(AhlulBayt News Agency) - Two Saudi policemen were injured in a bomb blast in eastern Saudi Arabia, according to the kingdom’s interior ministry on Tuesday.
30 May 2017 - 12:27
News ID: 833012