Police say 18 people entered UK on Israel passports to carry out killing . A total of eight people took part in assassination , police say . Dubai 's police chief says he is `` 99-percent '' certain Dubai involved in killing .
Police say eight people entered Dubai on UK passports to carry out killing . A total of 18 people took part in assassination , police say . Dubai 's police chief says he is `` 99-percent '' certain Israel involved in killing .