An armed police officer stands on the snow-covered rooftop of the Hotel Davos and looks out over the Congress Center, the venue for the World Economic Forum (WEF) in Davos, Switzerland, on Tuesday, Jan. 22, 2013. World leaders, Influential executives, bankers and policy makers arrive in the Swiss Alps for the 43rd annual meeting of the World Economic Forum in Davos, the five day event runs from Jan. 23-27. Photographer: Jason Alden/Bloomberg