Turkish President Recep Tayyip Erdogan on Friday mocked the EU's contribution to easing the Syrian refugee crisis, saying the bloc had been awarded the Nobel Peace Prize for accepting just a tiny number of asylum-seekers.

Speaking after Turkey and the EU agreed a plan for improving the handling of the refugee crisis, Erdogan also questioned whether Brussels treated Ankara's long standing membership application seriously.

Europe's migrant crisis took a dark turn late Thursday when an Afghan man seeking to cross from Turkey was shot dead by Bulgarian border guards, shortly before the EU and Turkey struck a deal to stem the refugee influx.

The killing is thought to be the first of its kind in Europe's worst refugee crisis since World War II.

U.S. President Barack Obama and Turkish counterpart Recep Tayyip Erdogan on Thursday vowed to step up the fight against the Islamic State group and strengthen Syria’s moderate opposition.

Speaking by telephone in the wake of Saturday's bomb attack in Ankara that killed 99 people, and weeks before Obama travels to Turkey for a G20 summit, they discussed sometimes difficult cooperation on countering Islamic State in Syria.

Turkish Prime Minister Ahmet Davutoglu on Wednesday warned the United States and Russia against "unacceptable" military and political support for Syrian Kurdish forces fighting the Islamic State (IS) group in Syria.

Turkey earlier summoned U.S. and Russian envoys to warn against supplying arms and support for Syrian Kurdish forces fighting the Islamic State (IS) group in Syria.

The Turkish interior ministry on Wednesday fired Ankara's top police chief and two other officials as President Recep Tayyip Erdogan admitted security shortcomings may have led to a double suicide bombing in the capital that killed 97 people.

There has been growing anger against Erdogan and the government for alleged security lapses over the worst attack in modern Turkey's history in which two suicide bombers blew themselves up in a crowd of peace activists on Saturday.

Bahadir Demircan, 37, a survivor of the double suicide bombing in Ankara, finds it hard to express the horror he experienced and struggles to imagine how he can carry on.

"We saw things that no one would ever want to see in their lives," said brown-haired Demircan, visibly exhausted and deeply saddened by the terrible memory of Saturday's bombings.

Turkish investigators were on Tuesday seeking to firm up suspicions that Islamic State (IS) jihadists were behind the double suicide bombings in Ankara that killed 97, as President Recep Tayyip Erdogan was due to break days of silence over the blasts.

Prime Minister Ahmet Davutoglu said Monday that the IS group was the prime suspect for the attack, Turkey's deadliest ever, which targeted a rally of labor, leftist and Kurdish activists.

Turkish Prime Minister Ahmet Davutoglu on Monday said the Islamic State (IS) extremist group was the prime suspect in the double suicide bombings in Ankara that killed 97 and sparked anger over the authorities' failure to ensure security.

In his first interview since Turkey was scarred on Saturday by its deadliest ever attack, Davutoglu insisted that a snap election would go ahead as planned on November 1 despite the bloodshed.

Thousands of people took to the streets of Ankara on Sunday to denounce the government of President Recep Tayyip Erdogan after 95 people were killed in twin suspected suicide bombings on a peace rally, Turkey's worst ever terror attack.

Prime Minister Ahmet Davutoglu declared three days of national mourning, with flags flying at half mast across the country, as questions grew over who could have ordered the Ankara bombings.

The Kurdistan Workers Party (PKK) is ready for a new ceasefire with the Turkish authorities despite almost three months of deadly violence, one of its leaders told AFP in an interview at its stronghold in northern Iraq.

The PKK, which since 1984 has waged an armed struggle for autonomy and greater rights for Kurds in Turkey, declared a ceasefire in March 2013.