Organisers of the Brazilian grand prix have signed a contract to keep the F1 race at Interlagos until 2015.
It was reported late last year that F1 chief executive Bernie Ecclestone intended to renew the deal, pending the promise of a much needed new paddock and pit complex and a new grandstand at the Autodromo Jose Carlos Pace.
Sao Paulo mayor Gilberto Kassab and Ecclestone have now officially signed the contract, local reports say.
