Activity in China's vast manufacturing sector may have decelerated further in June, the flash estimate of the HSBC China purchasing manager's index (PMI) is expected to show, exacerbating worries about a downturn in the world's second largest economy. The closely-watched flash PMI survey due on Thursday could fall to as low as 48.7, according to estimates by Credit Agricole and Nomura, worse than the final reading of 49.2 in May when the index moved into contractionary territory in seven months. A reading above 50 indicates expanding activity and one below 50 signals contraction. "The manufacturing sector is going ... (full story)