SAO PAULO (Reuters) – Brazil’s federal police on Thursday conducted raids as part of a probe into petrochemical producer Braskem’s sinking ground havoc in the city of Maceio, which has forced about 60,000 people to be moved since 2018. The subsidence related to the operations of Braskem’s more than thirty salt mines under the coastal city of nearly 1 million people in northeastern Brazil was thrust back in the spotlight this month after part of a mine collapsed. Braskem began extracting rock salt in Maceio in the 1970s but operations were halted in 2019 after authorities said they contributed …