A post mortem on David Hockney's assistant and friend Dominic Elliott has shown "no obvious natural causes for his death," Humberside Police has said.
Further tests will now be carried out, but their results will take some weeks.
More top news
The cyclist said the victory was as sweet as his first win as he became the first Briton to win the race three times.
Local police confirmed the explosion, which occurred near Nuremberg.
Temperatures slide a couple of degrees