A petrol bomb hurled at a Bahrain police patrol on Wednesday left one policeman wounded, the interior ministry said.
A "terrorist group" targeted the patrol in the suburb of Juffair, the ministry said, using a term usually employed to refer to Shiite youths who frequently clash with security forces.
"The terrorist group also burned a motorcycle that belonged to a restaurant, and vandalised a car parked in the area," the ministry said in a statement.
Attacks on police have become frequent in the Sunni-ruled Gulf monarchy that has a Shiite majority, while protesters frequently clash with security forces in Shiite villages.
On Sunday, a Bahraini court jailed for life two Shiites convicted of blowing up a car outside a Sunni mosque in a July attack that left no casualties.
A Shiite-led uprising to demand a democratic reforms was crushed in March 2011.
At least 89 people have been killed since the protests began, according to the International Federation for Human Rights.
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