WASHINGTON (AP) – Freddie Mac has sued 15 big international banks, including JPMorgan Chase, Bank of America and Citigroup, accusing them of rigging a key interest rate and causing huge losses for the government-controlled mortgage giant.

Freddie filed the lawsuit Thursday in federal court in Alexandria, Va. It names the banks that set the London interbank offered rate, known as LIBOR, which provides the basis for trillions of dollars in contracts around the world, including mortgages, bonds and consumer loans.