French authorities have placed four suspects in pre-trial custody over a potential bomb plot that potentially had links to Iran. The suspects, three teenagers and one adult, are accused of manufacturing, transporting and handling an explosive device and attempting to destroy property as part of a terrorist organisation. The device, which was attached to a petrol can and a large pyrotechnic charge, is the most powerful of its kind ever identified in France and could have generated a powerful fireball several hundred yards away. All four deny any intent to harm the public.