An armed man has stolen jewels worth about 40 million euros in the French Riviera resort of Cannes. Officials say the hold-up took place on Sunday morning at a jewellery exhibition at the Carlton Hotel. The theft is the largest in a series of high-profile robberies in Cannes, which is famous for its annual film festival. An exhibition of diamonds by the jeweller Leviev was being held in the lobby of the hotel. Local media say the thief made off with the jewels in a briefcase. It is not yet known who the owner was. If the value of the jewels is confirmed, it would reportedly be the second-largest heist in France.