london standard charter close bank account link gupta family south africa 2014 spokeswoman bank say thursday able comment detail client transactions confirm internal investigation account close us early 2014 spokeswoman say email gupta family trio indian-born businessmen scrutiny close tie south african president jacob zuma britain financial conduct authority separately say contact stanchart hsbc follow report british newspapers britain finance minister ask regulators investigate lenders possible tie gupta family zuma fca already contact bank name consider carefully responses receive regulator say fbi u.s. also investigate matter hsbc decline comment stanchart close account link south africa 's gupta family 2014