A US law firm is reportedly taking steps to build a class-action lawsuit against the world’s biggest mining company. Business Wire reports that Lundin Law is urging investors with losses to contact it regarding possible violations of federal securities laws by BHP Billiton. The wire service adds that the Lundin investigation is related to allegations that certain statements issued were false, misleading or failed to disclose material information. The probe, under Sections 10(b) and 20(a) of the Securities Exchange Act, is said to centre on a February 23 Bloomberg Business report that Brazilian police were pursuing the arrest of certain executives involved at the Samarco iron-ore operation, where there was a catastrophic tailings dam failure on November 5.