Witnesses have reported hearing a series of explosions at a industrial site in the Derbyshire town of Belper.
Pictures circulating on social media show billows of black smoke above the site.
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Four Britons are dead after a serious crash in Al Khalas, a settlement roughly 30 miles north of the holy site of Mecca.
So-called Islamic State said they were behind the attack that targeted people receiving their national identification cards.