(West Greenwich, RI) -- Biotech company Amgen is constructing a new facility at its West Greenwich campus. A groundbreaking was held on Tuesday for a 200-million-dollar, 120-thousand-square-foot addition, which the California-based company says will be used to manufacture medicines for the U.S. and global markets. The existing plant, federally licensed in 2005, makes commercial and clinical bulk drug substance. Amgen says it expects to add 150 manufacturing jobs with the new facility.