An economic indicator shows that manufacturing grew at its slowest rate in six months during April, Reuters reported. Financial data firm Markit said the preliminary reading of the Manufacturing Purchasing Managers Index fell from 54.6 to 52 this month, which was the slowest reading since October 2012. The results suggest that "the picture looks to have already began to darken again, with growth set to weaken in the second quarter," Chris Williamson, chief economist at Markit, told Reuters.