The regional police Commissioner of Arusha, Magesa Mulogo, said the woman died in hospital as a result of the bombing in the Arusha church just before mass.
Mr Mulogo said eyewitnesses reported that the bomb was thrown from a motorcycle into the church. He said the driver of the motorcycle had been arrested.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com