DUBAI - An improvised bomb wounded four Bahraini policemen on Saturday, a commander said, as police clashed again with protesters demanding the release of a jailed rights activist on hunger strike.

Unrest has racked Bahrain for more than a year, with mainly majority Shi'ite protesters demanding more democracy and an end to what they see as discrimination in the Sunni-ruled kingdom.

"The officers were dealing with saboteurs who were terrorizing citizens ... and damaging public and private property," Public Security Chief Major-General Tariq al-Hassan told the state-run Bahrain News Agency.

One policeman was critically wounded by the early morning blast in the village of Bani Jamra, west of the capital Manama, and the others suffered burns, Hassan said.

Please LIKE our Facebook page - it makes us stronger