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There are fears of water contamination after a bridge collapsed in northern Brazil at the weekend, sending lorries carrying thousands of litres of pesticides and sulphuric acid into the river below.

The project entails converting sulphur dioxide into sulphuric acid, which is then neutralised with limestone to generate gypsum waste.

He told a jury he used a gun to ensure he could attack Mr Smith with sulphuric acid "without a struggle ensuing so there was no transfer of DNA".

Mr Smith had been lured from his home, shot in the face before sulphuric acid was poured over him as he lay dying.

Mr Smith had been lured from his home, shot in the face then had sulphuric acid poured over him as he lay dying, Manchester's Minshull Street Crown Court has heard.