Turkish police detained 11 foreigners suspected of being members of a cell of the so-called Islamic State linked to the suicide bombers who staged the attack this week at Istanbul's main airport.
Turkish broadcaster Haberturk said on its website that the arrests in the dawn raid, by a counter-terror police squad in the Basaksehir district of the city, brought the number of people detained in the investigation to 24.
A police spokesman could not confirm the report, which was also carried by other media.
Three suspected IS suicide bombers killed 44 people in a gun and bomb attack at Istanbul's main airport on Tuesday, the deadliest in a string of attacks in Turkey this year.
The suspected suicide bombers were Russian, Uzbek and Kyrgyz nationals, a Turkish government official said yesterday.
Separately, security forces on Wednesday detained four Turkish citizens at the Oncupinar border gate in southeast Turkey on suspicion of membership in a terrorist group, the local governor's office said in a statement.
The four were attempting to return to Turkey from a conflict zone in Syria under the so-called Islamic State militant group’s control, it said.
Russian, Turkish FMs hold first meeting since ties repaired
Russian Foreign Minister Sergei Lavrov has met his Turkish counterpart Mevlut Cavusoglu for the first time since Moscow and Ankara mended ties that were shattered over the downing of a Russian jet last year.
"We hope that this encounter will set the right tone for the normalisation of relations," Mr Lavrov was quoted as saying by TASS news agency at the start of their meeting on the sidelines of a regional economic cooperation conference in the Black Sea resort of Sochi.