The United Nations has warned that the number of Syrian refugees could double and reach three million people by the end of this year if the unrest does not end.
According to the UN High Commissioner for Refugees (UNHCR), so far 1.5 million Syrian civilians have fled to neighboring countries, including Turkey, Lebanon and Jordan.
UN figures also show that more than four million Syrians have been internally displaced since the beginning of the unrest in the Arab country more than two years ago.
UNHCR says it has registered close to 1 million refugees since the start of 2013 alone, which amounts to about 250,000 people each month.
Syria has been experiencing unrest since March 2011, and many people, including large numbers of Syrian troops and security personnel, have been killed in the violence.
Several international human rights organizations have accused militants fighting against the government of President Bashar al-Assad of committing war crimes.
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