Federal securities regulators said Friday they have been investigating JPMorgan Chase's hedge-fund losses.The announcement followed CEO Jamie Dimon's admission that $2 billion was lost from "egregious mistakes" on a hedging strategy. JPMorgan Chase, the biggest U.S. bank by assets, estimates the business unit will post a loss of $800 million this quarter, when it previously forecast a profit of $200 million. Dimon said in a hastily arranged conference call to investors that the report "puts egg on our face." He linked the losses to a trader nicknamed the "London Whale," who had allegedly amassed a outsized position that hedge funds bet against. Regulators said Friday that they had discussions with JPMorgan Chase the division that allegedly lost the money for a month.