Telephone Interview. Interviewers clearly using a scoresheet or similar method to judge replies to questions. No discussion at all. Questions are asked, and you live and die by the exact answer you happen to give. Very poor.
Combine this interview experience with the fact that everything is done via an automated recruitment system (i.e. the first time you speak to somebody about one of their roles will be the interview itself), and the whole recruitment process at Amnesty seems to be geared specifically to make the organisation appear as soulless as possible, which is ironic given the nature of Amnesty's stated aims. A pity, really.
Oh, and if you send an email to their recruitment department don't expect a response.