Three Iraqi policemen have been killed, including one in a sabotage attack on powerlines supplying electricity from Iran, officials said on Wednesday.

"The electricity supply of 400 megawatts from the Iranian city of Kermanshah to Diyala (province) has been suspended as a result of a sabotage Tuesday that destroyed four towers and cut the line," said Mussaab al-Mudares.

The electricity ministry spokesman said the attack took place in the region of Lake Hamrin, some 50 kilometres (31 miles) northeast of Baquba. The collapse of the towers killed one officer and wounded two others.

The ministry announced on Monday the establishment of a new power line of 400 megawatts between the Iranian city of Karha and Amara, 300 kilometres to the south of Baghdad.

Four lines, with a total capacity of 1,000 megawatts, now link Iran to Iraq, which suffers from severe power shortages.

In Dhuluiyah, 90 kilometres (55 miles) north of Baghdad, the town's police chief, Lieutenant Colonel Mohammed Khaled, was killed by a magnetic bomb attached to his car, said police.

The attack also wounded the town's head of security, Taleb Hamad, and two bodyguards who were in the vehicle.

In Fallujah, 60 kilometres west of Baghdad, Yasser Jumaili, captain of a police anti-terror unit, was killed in an attack on his home by unknown assailants, said police.

And in the disputed northern city of Kirkuk, two people were killed in separate explosions caused by magnetic bombs attached to their cars.

An executive director of a railways company, Walid Khodair Said, of Kurdish origin, was killed in the south of the city.

Soon afterwards, an entrepreneur of Arab origin, Nazem Assis Mansur al-Tai, was killed in southeast Kirkuk, a security official said.