Facial injuries sustained when a letter bomb exploded as it was being opened. No further info. It is not uncommon for small explosive devices to be sent in the post to targeted individuals. The device is usually contained within a large padded envelope and detonation is usually achieved when the envelope is opened by an unsuspecting recipient. Injuries sustained in such circumstances are usually confined to the face and are often characterized by linear abrasions and lacerations radiating from a point in front of the face.