US investigators have launched a homicide inquiry after a massive wildfire in California left two firemen dead.There is forensic evidence that the inferno, the biggest in California’s history, was started deliberately. The two victims died when their truck careered off a steep mountain road and now the authorities want the arsonists found and prosecuted. Rita Wear of the US Forest Service Law Enforcement and Investigations said: “The LA County Sheriff’s Department Homicide Bureau has initiated an investigation due to the tragic deaths as a result of this fire.” The inferno destroyed nearly 600 square kilometres of forest land and dozens of homes. It has been raging for more than a week although firefighters say they now have almost half of it contained. Thousands of evacuees have been able to return to their homes. More than 5,000 firefighters were deployed and the cost so far in tackling the inferno is over 17 million euros.