L For the purposes of this Convention, the term "torture" means any act by which severe pain or suffering, whether physical or mental, is inten tionally inflicted on a person for such purposes as obtaining from him or a third person information or a confession, punishing him for an act he or a third person has committed or is suspected of having committed. or intim idating or coercing him or a third person, or for any reason based on dis crimination of any kind, when such pain or suffering is inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity. It does not include pain or suffer ing arising only from, inherent in or incidental to lawful sanctions.