ISLAMABAD (Reuters) - US Secretary of State Hillary Clinton will visit Tajikistan and Uzbekistan this weekend to bolster ties with two countries lying on an Afghan supply route that could help Washington reduce its dependency on Pakistan as ties sour with its main regional ally. Clinton will meet Tajik President Imomali Rakhmon on Saturday and move on to Uzbekistan for high-level meetings before heading home on Sunday, the State Department said, as Clinton wrapped up a trip to Afghanistan and Pakistan. The trip marks Clinton's second swing through Central Asia in less than 12 months, a reflection of Washington's increased focus on Afghanistan's northerly neighbours as it begins drawing down US troops from the 10-year Afghan conflict.