ISLAMABAD -- Hamid Karzai, the president of Afghanistan's transitional government, spent much of his time on a recent visit to neighboring Pakistan discussing the mounting security challenge faced by his beleaguered government.

More than a year after taking charge of Kabul, the Afghan capital, the U.S.-backed Karzai is eager to seek Pakistan's support in the arrest of leaders of Afghanistan's former Taliban regime.

Karzai, for the first time, announced the names of at least four Taliban leaders believed by his government to be hiding in Pakistan and responsible for a spate of recent attacks on U.S. and Afghan government troops.