Ambuja Cements, India’s third-largest cement maker, said on Wednesday its September shipments fell 4.2 percent to 1.29Mt from 1.34Mt a year earlier. Production fell an annual 4.6 percent to 1.27Mt, the company said in a statement. Swiss cement maker Holcim owns more than 36 percent of Ambuja Cements and has said it would launch an open offer to buy another 20 per cent.