Polls have opened in Ireland's abortion referendum. The vote will decide whether to repeal a part of the Eighth Amendment of the Constitution, which effectively bans terminations. Currently, abortion is only allowed in cases where a woman's life is at risk, though not in instances of rape, incest or fatal foetal abnormality. Polls opened at 07:00 local time (06:00 GMT) and will close at 22:00 on Friday.