Formula 1 gossip and rumours from international media

Formula 1 supremo Bernie Ecclestone has travelled to Germany to meet a state prosecutor investigating alleged payments of £30m to a German banker during the sale of the sport's commercial rights five years ago.Full story: Reutersexternal-link

Lewis Hamilton has issued McLaren with the starkest warning yet that he is prepared to walk away from the team unless they give him a car good enough to win his second world championship. "I have got only a short period in Formula 1 and I want to be competitive," he said. "I want to win championships. If you're in a good enough place and you're happy then there's no need to go anywhere. But loyalty has its limits." Full story: The Guardianexternal-link

McLaren driver Lewis Hamilton has bought musician Prince's famous Fender Stratocaster gold guitar at an auction for $100,000 (£61,100). Full story: Daily Telegraphexternal-link

The two most powerful voices in Formula 1 are opposing plans to introduce "green" engines as the sport counts the cost of developing expensive new technology. Full story: The Times (requires subscription)external-link

Governing body the FIA has been asked by Sauber to look into whether improvements can be made to cockpit safety in the wake of Sergio Perez's lucky escape in Malaysia. Full story: Autosportexternal-link

Pirelli has defended the amount of 'marbles' littering circuits this year in the wake of complaints from drivers that they could cause accidents, insisting that you "can't cook an omelette without breaking eggs".Full story: Daily Telegraphexternal-link

Renault has decided to wait until the Turkish Grand Prix to run the latest of its major updates, with the team confident that small tweaks to its R31 will be enough to help it challenge for a podium finish once again in China. Full story: Autosportexternal-link

This story will be updated throughout the day