NEW : In a separate incident , NORAD intercepts an aircraft in the vicinity of Camp David . The pilot is told to land at Andrews AFB and then fly back over Washington DC. Marine One was reportedly diverted because of bad weather . CNN 's weather team found no signs of stormy weather in the area .
NEW : In a separate incident , NORAD intercepts an aircraft in the vicinity of Camp David . Obama left for Camp David on the presidential helicopter but apparently arrived by car . Marine One was reportedly diverted because of bad weather . CNN 's weather team found no signs of stormy weather in the area .