Bomber that crashed during test flight at Edwards air force base in California killed all eight crew members

The US Air Force plane crashed shortly after takeoff from Edwards Air Force Base in California.

An official said an investigation could take up to six months and noted the B-52 in question was involved in a "radar modernization program."

Eight people were killed after a US Air Force B-52 bomber crashed shortly after take-off from Edwards Air Force Base in California's Mojave Desert on Monday.