Secretary of State Condoleezza Rice says Uzbekistan could face sharp cuts in US aid if it does not address concerns about human rights. The United States, the European Union, and UN officials are pushing Uzbek President Islam Karimov to allow an international investigation of last week's violence in the city of Andijan. President Karimov has rejected the request for an international investigation into the incident, in which witnesses say more than 500 people were killed when troops fired on protesters. The government says 169 people died and blames Islamic militants. Washington cut 11-million dollars in aid to Uzbekistan last year because it failed to meet U.S. human rights requirements. The State Department says another 22-million dollars is at risk this year if it is determined the Karimov government is not meeting human rights obligations.