Three Turkish police officers and six Islamic State militants were killed in a gunfight in northwest Turkey on Monday, the Interior Minister said, a week after more than 100 suspected IS militants were detained for planning Christmas and New Year attacks.

Interior Minister Ali Yerlikaya said eight police and another security force member were wounded in a raid on a property in the town of Yalova, on the Sea of Marmara coast south of Istanbul. More than 100 addresses were raided nationwide early on Monday.

Turkey has stepped up operations against suspected IS militants this year, as the group returns to prominence globally.

The United States carried out a strike against the militants in northwest Nigeria last week, while two gunmen who attacked a Hanukkah event at Sydney's Bondi Beach this month appeared to be inspired by Islamic State, Australian police have said.

On December 19, the US military launched large-scale strikes against dozens of IS targets in Syria in retaliation for an attack on American personnel.

Raid lasted hours

Police raided the house in Yalova on the suspicion that militants were hiding there overnight. Sporadic gunfire was heard during the operation, which lasted nearly eight hours, according to a Reuters photographer at the scene.

Last week, Turkish police detained 115 suspected Islamic State members they said were planning to carry out attacks on Christmas and New Year celebrations in the country.

Yerlikaya told reporters that the militants killed in Monday's attack were all Turkish citizens, adding that five women and six children were brought out of the property alive.

In the last month, police arrested a total of 138 Islamic State suspects and carried out simultaneous operations on Monday morning at 108 different addresses in 15 provinces, he added.

Wave of IS attacks in 2015-2017

Police had sealed off the road approaching the house in the early hours and smoke was visible rising from a nearby fire, while a police helicopter flew overhead.

The Istanbul chief prosecutor's office said last week that Islamic State militants were planning attacks against non-Muslims in particular.

Almost a decade ago, the jihadist group was blamed for a series of attacks on civilian targets in Turkey, including gun attacks on an Istanbul nightclub and the city's main airport, killing dozens of people.

Turkey was a key transit point for foreign fighters, including those of Islamic State, entering and leaving Syria during the war there.

Police have carried out regular operations against the group in subsequent years and there have been few attacks since the wave of violence between 2015-2017.