Daughter-in-law accused of murdering three family members with poisoned Christmas cake says she is innocent - and questions how the 'arsenic-laced flour' got into the house

The Brazilian woman accused of killing and harming several relatives with an arsenic-laced Christmas cake has broken her silence to insist she did nothing wrong. Officials confirmed yesterday the source of the contamination was poisoned flour used in the cake Deise's mother-in law Zeli dos Anjos baked and said the 'extremely high' levels of arsenic could never be 'naturally-occurring.' Deise Moura was taken initially to a police station at Canoas, then to Torres police station and is now in the women's jail in the city Zeli dos Anjos prepared the traditional 'Bolo de Natal' festive treat for a family afternoon coffee Pictured: The Christmas cake that was consumed by guests on December 23 Referencing an apparent 20-year-old dispute between Zeli and other members of her family which detectives have alluded to as a possible motive, Mr Pontes added in comments to local media: 'Deise never hid the fact that she had disagreements with her mother-in-law. Zeli's teacher sister Maida Bernice Flores da Silva, 58, another sibling called Neuza Denize Silva Dos Anjos, 65 and Neuza's daughter Tatiana Silvia Dos Santos, 43, died within hours of eating the cake late on December 23. 10 year old Matheus Marques da Silva who survived eating the poisoned cake with Father Leonir Alves at the hospital in Torres, Brazil Several members of the family died after eating the cake Neuza Denize Silva dos Anjo, 65, was rushed to hospital in critical condition before dying the following day The mother of one had been arrested at her home in Nova Santa Rita late on Sunday No arrests have yet taken place in the Parnaiba poisoning horror.