JPMorgan banker testifying for cartel prosecutors says there was no agreement

SYDNEY (Reuters) - A prosecution witness in an Australian criminal cartel case against Citigroup Inc and Deutsche Bank AG said on Friday that the banks never colluded, but that he helped a regulator build its case to get immunity.The testimony from former JPMorgan Chase & Co markets head Jeff Herbert-Smith in court is a blow to the prosecution, which is relying on JPMorgan to support a case that the three global investment banks engaged in criminal cartel behaviour in a A$2.5 billion share..