 Analysts at Berenberg have reiterated a sell rating at 4,000p price target on Rio Tinto PLC LSE:RIO shares as they feel the FTSE 100-listed miner remains a dividend risk, and more so if iron ore does not rally on any China support. The German banks analysts noted that the 20th National Congress of the Chinese Communist Party, which will end on October 22, is expected to announce an economic stimulus, but this has not happened yet. 