An Australian man accused of killing 51 Muslim worshippers in New Zealand’s worst mass shooting changed his plea to guilty in a surprise move on Thursday. Brenton Tarrant, who appeared by video link, admitted to 51 charges of murder, 40 charges of attempted murder and one charge of committing a terrorist act in a hastily called Christchurch High Court hearing. “The entry of guilty pleas represents a very significant step towards bringing finality to this criminal proceeding.”