REPUBLIKA.CO.ID, ANKARA -- Turkish police detained 20 Islamic State (IS/ISIS) suspects in the Mediterranean resort of Antalya on Friday, barely 10 days ahead of a G20 summit there being attended by world leaders, local media reported.

Counter-terrorism police launched simultaneous raids in Antalya and surrounding neighbourhoods, the private Dogan news agency reported, adding that the suspects were "in contact with IS militants in Iraq and in Syria".

US President Barack Obama and Russian President Vladimir Putin are among G20 leaders attending the Antalya summit on November 15-16, where the war in Syria and the international fight against the Islamic State group are set to top the agenda.

Turkey has been on the hunt for IS extremists since twin bombings on a peace rally in Ankara last month that killed 102 people and wounded around 500, the worst such attack in the country's history.

There was no immediate comment from the prime minister's office about the Antalya operation.

Foreign Minister Feridun Sinirlioglu had said this week that Ankara was planning further military action against the jihadists in the "coming days", without saying how or where.

In another development, police caught six people, five of them foreigners, attempting to cross into Syria from a Turkish border town to join the ranks of IS, the local governor's office said.

Adding to concerns about increasing IS infiltration in Turkey, two sisters aged 18 and 20 have been missing since going to an Islamist training camp in Istanbul late last month. Their family has called on the authorities to help, as there are fears they have been recruited by the militants.

The government says hundreds of Turks have already joined the extremists in Syria although the actual number could be much higher.

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