A policeman died on Saturday of wounds sustained in a bombing near East Eker village, south of the capital Manama, Bahrain's Interior Ministry announced.
The ministry said the policeman was on duty when the explosion occurred on Friday night.
The Chief of Public Security Major General Tariq Al Hassan said the policeman, Mahmood Fareed, died in the early hours of Saturday after he was transferred to a hospital.
Investigation has been launched to identify and arrest the suspects.
According to official figures, 13 police officers have been killed and more than 2,600 people have been injured since Bahrain' s majority Shiites led large-scale protests against the Sunni monarchy in 2011.