Police in northern Iraq say security forces have killed at least two people and wounded several others who were protesting a rise in fuel prices and lack of basic services in the city.

Authorities say Sunday's riot broke out in a mainly Kurdish district of Kirkuk, as angry protesters set fire to several gas stations and an oil company building in the city. Police later imposed a curfew.

In Baghdad, a bomb blast near one of Iraq's largest oil refineries triggered a pipeline fire that threatened to worsen the country's oil crisis. The bombing was the second in recent days.

Meanwhile, Iraqi police say at least 11 car bombs - most of them in Baghdad - exploded Sunday, wounding at least 20 people.

Some information for this report provided by AP and AFP.