The number of Syrian refugees in Turkey has exceeded 600,000 and more than 400,000 of them are living outside the refugee camps set up mainly in Turkish border cities, the Turkish disaster management agency said on Monday.

"We conducted a study before the Eid (al-Adha) holidays and the numbers have increased above 600,000," said Mustafa Aydogdu, spokesman for the Disaster and Emergency Management Directorate.