Asian stock markets fell on Thursday amid speculation that China, the region’s economic engine, may announce gross domestic product slowed in the second quarter. Europe’s debt crisis and signs of weak growth in the United States are undermining demand for Chinese exports and have investors concerned that a slowdown in the world’s second-largest economy could be worsening. China is scheduled to announce GDP results for the April to June period on Friday, and growth likely slowed to 7.9 percent, the worst reading since the aftermath of the 2008 global financial crisis, Singapore’s DBS Bank said.—AP