The FBI will probe the Yahoo security breach that exposed information from 1 billion accounts and Verizon said it wants to see better terms in its merger deal with the company.

Verizon agreed to buy Yahoo for $4.8 billion, but wants it to amend the terms of the deal to reflect the damage from the two major hacks of its service. It threatened to go to court to end the deal if it is not changed.

Yahoo said hte latest breach may have included included names, email addresses, telephone numbers, dates of birth, hashed passwords and, in possibly even encrypted or unencrypted security questions and answers in some cases.

Verizon had said it was reviewing the deal in September after Yahoo disclosed the first major security foul-up. Wednesday it said it will “review the impact of this new development before reaching any final conclusions.”

Meanwhile, the White House said the FBI would probe the Yahoo breach and Democratic Senator Mark Warner of Virginia who is the number one Dem on the Senate Intelligence Committee said he was going ot look into Yahoo’s security practices.

In Germany, the cyber security authority told Germans to consider safer alternatives for email.

Security advisors commenting on the Yahoo breach have suggested that users shut down active Yahoo accounts.

Yahoo is requiring users to reset their passwords following the latest revelation.