Four survivors of a tour helicopter crash in the Grand Canyon were airlifted to a Nevada hospital Sunday while crews were recovering the bodies of three others, authorities said. Six passengers and a pilot were on board the Papillion Grand Canyon Helicopters chopper when it crashed under unknown circumstances around 5:20 p.m. Saturday on the Hualapai Nation near Quartermaster Canyon, which is near the Grand Canyon's West Rim, AP reported. Hualapai Nation Police Chief Francis Bradley said the survivors were taken to a Las Vegas hospital as of 2 a.m. Sunday. Authorities said the four were level 1 trauma patients. The identities and nationalities of the dead and injured weren't immediately released.