Hackers broke into the computer networks of some big U.S. law firms, including Cravath Swaine & Moore LLP and Weil Gotshal & Manges LLP, the Wall Street Journal reported on Tuesday.
Federal investigators are looking to see if confidential information was stolen for insider trading, as these law firms represented Wall Street banks and big companies, the Journal said, citing people familiar with the matter.
Hackers have threatened more attacks in postings on the Internet, the Journal said.
Cravath Swaine & Moore and Weil Gotshal & Manges were not immediately available for comment.
