More than two million refugees have fled over borders to escape the fighting in Syria, according to new figures from the UN's refugee agency.
The vast majority - around 1.8 million - have left in the last year of the 30-month conflict, suggesting that the flow is increasing.
UNHCR also estimates that the number of people displaced within Syria's borders has swelled to 4.25 million.
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A US Twitter study has found that there are almost 50,000 active pro-Islamic State accounts, but say the number could be as high as 90,000.
In its first test, the 30-kilowatt military laser burned through a truck's engine in a matter of seconds.
Islamic State militants have begun to raze ancient ruins at the site of the Assyrian city of Nimrud.