An explosion at a residential building in Monaco has left three people injured, including Ukrainian oligarch Vadym Yermolaiev, in an incident that the authorities say was almost certainly an attack targeting the tycoon. Mr Yermolaiev's wife suffered very serious injuries in the attack and was being treated in a hospital in Nice, according to Christophe Mirmand, the minister of state for Monaco. Local media reports said she underwent a lower-limb amputation.