Efforts to recover and identify badly burned remains from the site of last Tuesday's Northern California helicopter crash are taking longer than expected. Officials say it's "taking quite a bit of work to extract them." The recovery was initially expected to be completed today. The helicopter was ferrying 10 firefighters, two pilots and a U.S. Forest Service employee back to base camp after crews battled a fire about 215 miles northwest of Sacramento. Nine people were killed. On Saturday, helicopters carrying flag-draped stretchers that bore some of the remains were greeted by an honor guard of firefighters at a forest base camp. A U.S. Forest Service spokesman says DNA analysis and dental records will likely be required for identification.