Investigators in the US have launched a fresh attempt to solve the world's biggest art robbery, in which hundreds of millions of dollars worth of works by Rembrandt, Vermeer and others were stolen from Boston's Isabella Stewart Gardner Museum. Eric Ives, the head of the Federal Bureau of Investigation's major theft unit, said he planned to appeal for information about the 1990 theft through a billboard campaign next year across the US and possibly even in London. The plan highlights the FBI's tightening focus on art crimes and its enthusiasm to solve a notorious case that has dogged its reputation...