Authorities in Bahrain say a policeman was injured after his patrol car was gutted in a firebomb attack during a wave of unrest across the Gulf nation.

The clashes and violence came less than a week after Bahrain's parliament set out tougher measures against so-called "terrorists" in the 30-month uprisings by majority Shiites, seeking a greater political voice in the Sunni-ruled kingdom.

The new steps include giving authorities greater ability to strip citizenship from people convicted of violence.

Bahrain's Interior Ministry said Sunday a policeman was injured after a group attacked the patrol car with homemade firebombs. Earlier, it said gas canisters exploded under a car near a public park. No injuries were reported.

Bahraini officials also moved Sunday to close websites believed linked to the uprising.

Bahrain is home to the U.S. Navy's 5th Fleet.