Dutch sleuth hopes reward will lead to breakthrough in biggest ever US art heist

A Dutch art sleuth who claims he is following two possible leads in the largest art heist in US history is hoping a $10m reward will help track down the collection stolen from a Boston museum in 1990.

Arthur Brand thinks a decision last month to double the reward for information could prompt the return of 13 works stolen from the Isabella Stewart Gardner Museum, though the museum's director of security says the leads Mr Brand is following have already been pursued and are considered dead ends.