...Deputy Attorney General Lisa Monaco said investigators had seized 63.7 Bitcoins, now valued at about $2.3 million, paid by Colonial (COLPI.UL) after last month's hack of its systems that led to massive shortages at U.S. East Coast gas stations....An affidavit filed on Monday said the FBI was in possession of a private key to unlock the hackers' Bitcoin wallet. It was unclear how the FBI gained access to this key...."Today, we've turned the tables on DarkSide," said Monaco, referring to a ransomware group widely believed to have been behind the crippling fuel pipeline attack.