The National Transportation Safety Board is investigating the midair collision of two firefighter helicopters in California that killed three people on Sunday.
According to multiple media sources, the two helicopters, a Bell and a Sikorsky S-64 Skycrane, were part of a six ship response to a fire in Cabazon, a small community in Riverside County approximately 90 miles east of Los Angeles. The initial fire call was for a structure fire, but it quickly spread to the dry grass and scrub brush nearby.
