Baghdad: A car bomb targeting a local police chief missed him on Wednesday but killed five people and wounded 15 in a Sunni town north of Baghdad, said Iraqi officials.

A police official says the morning blast missed the convoy of police Col Qandil Khalil, the head of Duluiyah police, as it was driving near a local market. Duluiyah, a former al-Qaeda stronghold, is 75 kilometres north of Baghdad.

A hospital official confirmed the death toll, adding that all casualties were civilians. All the officials spoke on condition of anonymity because they were not authorised to release information.

Meanwhile, the journalists' watchdog group Reporters Without Borders demanded today that Iraq's government start an investigation into the killing yesterday of a local TV presenter in Tikrit, another Sunni town north of Baghdad.

Kamiran Salaheddin, a presenter for the local Salaheddin Channel, was killed by a sticky bomb attached to his car.

"The Iraqi authorities must do everything possible to ensure that those responsible for his death are brought to justice. His murder must not go unpunished," said the RSF.

Iraq ranked 152nd out of 179 countries on RSF's press freedom index for 2011-2012, after dropping 22 ranks on the list from the year before. Although violence has dropped significantly in Iraq, insurgents’ attacks are still frequent.