Fire crews searched a rugged area near Mulholland Drive and Beverly Glen Boulevard on Saturday night for a light plane that was reported missing, according to the Los Angeles Fire Department. The search was being hampered by fog in the Beverly Crest neighborhood, the LAFD said in a statement Saturday night. “Though thick fog now precludes safe air operations, more than four dozen LAFD ground personnel are continuing their systematic grid search” in the mountainous area, the statement said.