'How' not 'who' the question after Louvre crown jewels smash and grab

French President Emmanuel Macron says everything is being done to catch the people behind a spectacular jewel heist at the Louvre, the latest in a series of museum robberies. After the brazen theft of some of France's crown jewels in broad daylight, staff and union representatives say not enough has been done to guard the objects and people at one of the world's most famous galleries.