Article 2(2) of the ECHR:
Deprivation of life shall not be regarded as inflicted in contravention of this Article when it results from the use of force which is no more than absolutely necessary:
- in defence of any person from lawful violence;
- in order to effect a lawful arrest or to prevent the escape of a person lawfully detained;
- in action lawfully taken for the purpose of quelling a riot or insurrection.’