Manama: A bomb exploded on Saturday in the Bahraini village of Sitra, east of Manama, causing minor injuries to a policeman, a source from Bahrain’s interior ministry said.

It was not immediately clear who planted the bomb or the extent of the damage.

The source said that some protesters in Sitra had also clashed with the police using iron rods and Molotov cocktails, but that no further details on casualties were available.

The kingdom has suffered low-level civil unrest since mass protests in 2011 led by Shiites demanding political reforms.

In 2011, Saudi Arabia sent forces to support Bahrain’s rulers and quell pro-democracy demonstrators demanding reforms. However, small-scale demonstrations remain frequent and often lead to clashes with security forces.

Negotiations between the government and opposition aimed at ending the turbulence have stalled.