Indian paramilitary soldiers stand guard during heightened security checks at Chennai International airport in Chennai, India, Thursday, Dec. 4, 2008. Indian airports were put on high alert after the government received warnings of possible airborne attacks. (AP Photo)AP – A Pakistani militant group apparently used an Indian operative as far back as 2007 to scout targets for the elaborate plot against India’s financial capital, authorities said Thursday, a blow to Indian officials who have blamed the deadly attacks entirely on Pakistani extremists.