Militants killed six police and five medical workers in separate attacks in southern Afghanistan, and President Hamid Karzai said Wednesday he believes the rebels are receiving support from the nation's booming drug trade. The police were killed by the militants who ambushed their convoy in mountains in Uruzgan province Tuesday, the second major attack on the fledgling force in two days, local Gov. Jan Mohammed Khan said. The attack on the medical workers occurred Wednesday near Kandahar city, said doctor Abdul Qadir, the director of Afghan Help Development Services, a local aid group that employed the five. Karzai made his comments about the violence in a press conference with U.S. Secretary of State Condoleezza Rice. He said there was "cooperation between the drug trade and terrorism." "We will have terrorism attacking (us) ... for quite some time," he warned.