Ed Miliband has welcomed the apology from Ukip leader Nigel Farage for what the Labour leader said was a "racial slur" against Romanians.
Mr Farage has apologised for comments he made in a radio interview last Friday but denied they were racist.
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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.