NewsX: While probe into the dastardly Naxal attack in Chhattisgarh, that left 29 people dead, is in full swing, investigators have stumbled upon grenades with made in China tags imposed on them. Besides the Naxal attack, the China based ammunition finding its way into the hands of Naxalites has triggered another bout of concern. In a NewsX exclusive, correspondent Shailesh Kumar tracks the source of weapons used by Maoists.