 Brazilian petrochemical giant Braskem SA said on Thursday it had been told by authorities in northeastern Brazil that residents of 1,918 homes had to be evacuated due to a geological event it has been accused of causing, and it was making an additional 1.6 billion reais 305 million in provisions. Federal and state prosecutors in the state of Alagoas had written to the company, alerting it of the need to move the residents, Braskem said in a filing. Prosecutors have alleged that a Braskem mine caused large cracks in the ground and serious damage to real estate in the city of Maceió, which was backed up by a report by the Brazilian geological service in May. Braskem has disputed this. 