Footage is said to show militants in Iraq smashing statues with sledgehammers in bid to crush what they call non-Islamic ideasIslamic State (Isis) has released a video purportedly showing militants using sledgehammers to smash ancient artefacts in Iraq’s northern city of Mosul, describing them as idols that must be removed.The destruction is part of a campaign by the extremists, who have destroyed a number of shrines including Muslim holy sites, to eliminate what they view as heresy.