Employees of an Audi plant in Brussels that is threatened with closure took the keys to around 200 vehicles in an attempt to force management to clarify the future of the site, the Belgian news agency Belga reported on Sunday. Until this happens, no car will leave the factory, the protesting workers said. Audi management said it would not give in to extortion and threatened to press charges if the keys are not returned by midday on Monday, Belga reported, adding that security cameras could be used to identify those responsible. Audi said in July the closure of the Brussels plant could not be r…