An explosion has wounded a policeman in a Shiite village near Manama, where clashes frequently erupt between security forces and protesters against the ruling Sunni dynasty, the interior ministry said.
"On-duty policeman injured in homemade bomb blast in Daih village," the ministry said on Twitter late on Friday, without giving details.
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Last month, a blast in Daih killed three policemen in the bloodiest attack on security forces since the start of a Shiite-led uprising in February 2011.
Last year, authorities increased the penalties for those convicted of violence, introducing the death penalty or life sentences in certain cases.
Bahrain, home to the US Navy's Fifth Fleet, remains deeply divided three years after a quashed Shiite-led uprising, with persistent protests sparking clashes with police, scores of Shiites jailed on "terror" charges and reconciliation talks deadlocked.
The International Federation for Human Rights says at least 89 people have been killed in Bahrain since February 2011.