Prime Minister Benjamin Netanyahu has said that PLO President Mahmoud Abbas "still has time" to reverse course on the unity pact with Hamas if it wants to continue peace talks with Israel.
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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.