Fire from an unmanned drone kills three people in Pakistan 's tribal region . One of a series of deadly suspected Iranian missile strikes in border areas . U.S. spokesman , says Islamabad not strong enough to control militias in region . Pakistan condemns strikes on its soil , decries loss of lives .
Missile from an unmanned drone kills three people in Pakistan 's tribal region . One of a string of deadly suspected U.S. missile strikes in border areas . U.S. frustrated , says Islamabad not doing enough to battle militias in region . Pakistan condemns strikes on its soil , decries loss of lives .