the british national , of polish origin but who has not been named , was arrested on saturday as part of an operation against the revolutionary people 's liberation party-front .
both the prosecutor and the hostage takers were killed after a police shoot-out .
members the banned leftist group - known as the dhkp-c - took senior turkish prosecutor mehmet selim kiraz hostage last week .
both the prosecutor and the hostage takers were killed after a police shoot-out .