More than 100 vehicles left Pakistan 's capital Islamabad to protest drone strikes . The protesters were demanding an end to the US drone attacks in Pakistan's tribal areas and a halt on CIA flights over Pakistani territory. American officials insist drone strikes meet strict standards .
More than 100 vehicles left Pakistan 's capital Islamabad to protest drone strikes . Senior government officials warn that the participants will not be allowed into South Waziristan . American officials insist drone strikes meet strict standards .