Because DS activity centers around southern China?  They may be tracking players currently or they may be pulling images off DS phones/messages from present or past secret meetings, and giving them more than a little paranoia or panic. (remember the Cali parking lot shot that immediately brought out a very tense-looking goon?) It's hard for us to understand the significance of the pictures without the inside information that the only the involved players have, but we can infer things like - there's a lot of Chinese penetration into our government.