Hackers broke into the computer networks at some of the country’s most prestigious law firms, and federal investigators are exploring whether they stole confidential information for the purpose of insider trading, according to people familiar with the matter.

The firms include Cravath Swaine & Moore LLP and Weil Gotshal & Manges LLP, which represent Wall Street banks and Fortune 500 companies in everything from lawsuits to multibillion-dollar merger negotiations.

Other law firms also were breached, the people said, and hackers, in postings on the Internet, are threatening to attack more.

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