Egyptian police have killed nine fighters after a heavy exchange of fire in a rural area outside of Cairo, security officials say. 

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The officials say Friday's shooting followed intelligence reports that pinpointed a group responsible for the killing of a policeman and the bombing of five electricity transmission pylons.

The said the police found a bomb and automatic weapons in the house where the fighters were killed in Ausim, a farming area about 5km from the Egyptian capital in Giza province.

The officials spoke on condition of anonymity because they were not authorised to talk to reporters.

The Interior Ministry said three policemen were wounded in an exchange of fire with what it called "terrorists".

Hours earlier, officials told the Reuters news agency that security forces killed nine members of the Muslim Brotherhood movement in the same operation.

The group, whose top leaders have been sentenced to death in what human rights groups call unfair trials, says it is committed to peaceful activism.

Egypt has been facing a burgeoning uprising by armed opposition groups, including fighters belonging to the Islamic State of Iraq and the Levant (ISIL) groups.

Attacks have primarily targeted security forces in the Sinai Peninsula but have also spread to other parts of the country.

Source: Agencies