President Asif Ali Zardari Saturday said Pakistan has to win the war on terror at any cost. In his message on completion of one year to the deadly Karsaz incident of October 18, 2007, the President reiterated the government's commitment to the war against terrorism and extremism. Paying rich tributes to the martyrs of Karsaz carnage, he said it is the sacrifice of the martyrs that democracy has been restored in the country.