Two Saudi policemen were shot dead on Wednesday when they came under fire in the kingdom’s east, where most of the minority Shia community live, the interior ministry said.
The pre-dawn attack happened near a farm in the Saihat area of Qatif, on the Gulf coast.
A ministry spokesman said the suspect or suspects had not immediately been identified.
It is the latest incident in the area as police continue to hunt suspects on a list of 23 wanted people issued in 2011 after Shias in Eastern Province began protests.
Shias in the Sunni-dominated kingdom have complained of marginalisation.
Last week, two Indian passersby and a policeman were wounded when officers came under fire from a farming area in Qatif.
Many suspects on the wanted list have already been detained or killed in shootouts.
